OPERATOR’S MANUALFOR

SU-231/PEQ (HWS M553) (1240-01-533-0941), REFLEX SIGHT, HOLOGRAPHIC, NVCOMPATIBLE, 123 LITHIUM VERSION BATTERY, EOTECH ORDER CODE: 553.A65

HWS M552 (1240-01-492-5264), REFLEX SIGHT, HOLOGRAPHIC, NV COMPATIBLE, AAVERSION BATTERY, EOTECH ORDER CODE: 552.A65

HWS M551 (1240-01-485-0441), REFLEX SIGHT, HOLOGRAPHIC, NV COMPATIBLE, NCELL VERSION BATTERY, EOTECH ORDER CODE: 551.A65

See inside cover for distribution statement.

L-3 Eotech Inc. Technical Manual ver. 1.7

JULY 2007

communicationsEOTechL3

DISTRIBUTION STATEMENT: Distribution is authorized to U.S. Governmentagencies and their contractors. This publication is required for administration andoperational purposes. Additional copies of this document can be found on themanufactuerʼs website. Written requests must be referred to:

L-3 EOTech Service Dept.Attn: TM Request

1201 E. Ellsworth RoadAnn Arbor, MI 48108

(734)741-8868 Option #8general@L-3com.com

DESTRUCTION NOTICE: Destroy the sightʼs operability by removing the batterycap, batteries, and then crushing the battery cap. Destroy this document by anymethod that will prevent disclosure of contents or reconstruction of the document.

This defense article is controlled under the International Traffic in ArmsRegulations (ITAR), and may not be exported to a Foreign Person, either in the U.S.or abroad, without a license or exemption from the U.S. Department of State.

The 553 is designed to mount only to rail systems that are made to the dimensionsof the current MIL-STD-1913 rail specification. Rails which do not meet thedimensional requirements of the MIL-STD-1913 specification may result in thesight fitting loosely, moving on the rail during recoil, or not allow the cam levers toclose properly.

WARNING

WEAPON SAFETY: Prior to mounting the HWS on your weapon, be sure the weaponis cleared. If you are not sure how to clear your weapon, please see the accompanyingoperator’s manual for the weapon platform you are mounting the sight on.

LASER SAFETY: The HWS is a Class II laser product. The Class II level illuminatingbeam, however, is completely blocked by the housing. The only laser light accessibleto the eye is the image beam and is at a power level within the limit of a Class IIa laserproduct. The illuminating beam can become accessible to the eye if the housing isbroken. Turn the sight off immediately and return the broken unit to the factory forrepair.

FCC COMPLIANCE: The HWS complies with Part 15 of the FCC Rules. Operation issubject to the following conditions: (1) this device may not cause harmful interferenceand (2) this device must accept any interference received, including interference thatmay cause undesired operation.

CAUTION

• Never disassemble the sight’s optical assembly. The optical cavity is purged,nitrogen filled, and sealed to achieve fog proof performance. Disassembly willvoid the warranty and render the sight inoperable.

• There is a 12 volt battery that is approximately the same size as the Type N 1.5 voltalkaline battery used in the M551. DO NOT USE the 12 volt batteries. They willseverely damage the sight.

• When used with a Night Vision device, always check to make sure the sight is offbefore pressing the NV button to turn on the sight in the Night Vision mode.Otherwise, it will toggle to the Normal mode and saturate the image intensifier.

• When a sudden increase in resistance is felt in the elevation or windage adjustmentshafts, the end of the adjustment range has been reached. DO NOT TURN THEADJUSTMENTS ANY FARTHER OR SERIOUS DAMAGE MAY OCCUR TO THESIGHT.

• Never clean the glass surface with a dry cloth or paper towel; always dampen theglass surfaces prior to cleaning

• All moving parts of the sight are permanently lubricated. Do not try to lubricate them.

• Do not use deteriorated or corroded batteries. Inspect batteries for rips, tears,dents, or cuts in the housing. If there is any exposed, internal content of the battery,it could effect the operation of the sight.

• The SU-231/PEQ (HWS M553) is designed to mount only to rail systems that aremade to the dimensions of the current MIL-STD-1913 rail specification. Rails whichdo not meet the dimensional requirements of the MIL-STD-1913 specification mayresult in the sight fitting loosely, moving on the rail during recoil, or not allow the camlevers to close properly.

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TABLE OF CONTENTS

Page1.0 INTRODUCTION............................................................................................ 1

1.1 General Information...............................................................................11.2 Key Attributes ...................................................................................... 21.3 Equipment Description ........................................................................ 41.4 Location and Description of Major Components ................................. 9

2.0 OPERATING INSTRUCTIONS.......................................................................11

2.1 Description of Components, Controls, and Indicators .........................112.1.1 Hood .........................................................................................122.1.2 Batteries ...................................................................................122.1.3 Replacing Batteries...................................................................142.1.4 Electronic Features...................................................................152.1.5 Night Vision Mode.....................................................................162.1.6 Windage and Elevation Adjustments ........................................17

2.2 Preventive Maintenance Checks and Services (PMCS) .....................192.3 Troubleshooting ...................................................................................212.4 Unit Level Maintenance and Repair ....................................................242.5 Installation of Equipment .....................................................................262.6 Zeroing Procedures .............................................................................28

3.0 MOUNTING SOLUTIONS..............................................................................33

3.1 M4/M16 Flat Top Co-witness .....................................................................343.2 M4/M16 Adjustable Cantilever Mount ........................................................343.3 M4/M16 Fixed Cantilever Mount................................................................353.4 M4/M16 Carry Handle Mount.....................................................................363.5 HK Low Profile ...........................................................................................373.6 HK Mid Profile ............................................................................................383.7 Tactical Shotgun Mount..............................................................................393.8 SIG SG-550 Mount ....................................................................................403.9 FN FAL Mount ............................................................................................413.01 PVS-14 Ring and Mount ............................................................................423.02 AK-47 Mount ..............................................................................................43

4.0 APPENDIX A, COMPONENTS OF END ITEM..............................................44

4.1 Basic Issue Items ................................................................................444.2 Replacement Items..............................................................................47

5.0 APPENDIX B, FACTORY CONTACTS ..........................................................50

1.0 INTRODUCTION

1.1 General Information

This manual is an overview of the SU-231/PEQ (M553), M552, and the M551Holographic Weapon Sights (HWS) or Reflex Sight, and will define the basicoperation, features/benefits, and options of this proprietary optical system. The ReflexSight is a state of-the-art optical sighting system, employing holographic sightingtechnology for small to medium caliber weaponry and launching type platforms. TheReflex Sight utilizes holographic optics fabrication technology that is used in theproduction of advanced heads up display in attack fighter aircraft for targeting, gaugereading, weapon system verification, etc. L-3 EOTech has miniaturized thesophisticated sighting heads up display system into a compact and rugged packagefor use on small arms and other weapon platforms.

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1.2 Key Attributes

The SU-231/PEQ (M553), M552, and the M551 reflex sights are lightweight, non-magnifying, optical sights designed for Close Quarter Battle. They allow very fasttarget acquisition and engagement at short ranges while providing aiming capabilityout to 300 meters equal to or better than iron sights.

The major combat advantage of the reflex sight is extremely rapid reticle-on-targetacquisition. As quickly as a target is identified, the holographic reticle can besuperimposed on the target. The sight allows operatorsto maintain eye contact on the target and to place theholographic reticle onto the target without shifting focus.Operators can quickly acquire the target and reticle in thesame focal plane for fast and accurate shot placement.

The reflex sight appears to project the holographic imageof a reticle on the target plane. The sight can be used asa bright open reticle image or a fine dot which is limitedonly by the acuity of the shooter’s eye. The reticlepattern is parallax free and the holographic heads up display window allows anundistorted and unrestricted view of the target.

The reflex sight standard reticle is displayed in Figure 1: 65 minute ring with verticaland horizontal stadia and a one MOA aiming dot.

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Fig 1:StandardReticle

The reflex sight offers extremely fast target acquisition in Close Quarter Battle (CQB)using the large ring, and aiming precision in longer range engagements (using theMOA Dot) without obscuring the target.

Another advantage of the Reflex Sight is the full field of view which allows the operatorbetter situational awareness. The Reflex Sight employs a true heads up display(HUD) window that eliminates blind spots and constricted or tunnel vision associatedwith scope sights. Controls are inset into the Reflex Sight housing with no protrudingknobs, battery compartments, or rings obscuring the target. Utilizing natural binocularvision is an advantage of this sighting system, as well as additional threatidentification through increased operator situational awareness and peripheral vision.

The reflex sight can operate in tandem with Generation I – IV+ night vision intensifiertubes. Operators can see the holographic reticle image with helmet mounted orweapon mounted night vision devices. The reflex sight is a passive system and emitsno signature from frontal or from a peripheral aspect. While in the NV mode, the sightis undetectable by opposing force night vision equipment. The HWS can bepositioned behind night vision systems without any “bloom” on the target area.

The primary use of the reflex sight is for the M4A1 carbine and CQBR in CloseQuarters Battle. The reflex sight is not however, limited to carbines. The reflex sightis currently employed on medium caliber machine guns, grenade launchers and lessthan lethal projectile launchers. The sight provides a 1X (no magnification) sightpicture and is not designed as a long range sight system, however, it can be used aseffectively as iron sights on targets to 300 meters. 3

The advantage of the reflex sight is that it provides the operator superior shootingperformance, rapid reticle-on-target acquisition, full field of view and accurate shotplacement. The reflex sight can be naturally employed by all levels of users, fromnovice to the most highly trained operator.

1.3 Equipment Description

SU-231/PEQ (M553)

OperationOptics: Transmission holography – 100% parallax freeMagnification: 1xEye Relief: UnlimitedLength/Width/Height: 4.9”x1.8”x2.8”Weight: 12.3 ozTemperature: -40 to 150 FWaterproof: Submersible to 66 ft depthSealing: Fogproof internal opticsColor/Finish: Flat Dark Earth (non-reflective black on some small components)Adjustment (per click): 0.5 MOA (1/2” at 100 yds)Adjustment Range: +/- 40 MOA travelMount: USSOCOM requirements dictated dual quick release throw levers designed

specifically for the Picatinny (MIL-STD-1913) mounting rail:• Certain commercial variants to the MIL-STD 1913 rail specification may not be compatible

with the SU-231/PEQ (M553) mounting assembly.

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• The SU-231/PEQ (M553) base consists of (2) ARMS® throw levers and is only adaptable torails that properly accept the ARMS® design.

Return to Zero: Repeatable to 1 MOA after re-mounting

Heads-Up-Display WindowOptical Surfaces: Anti-glare coatingWindow Dimensions: 1.20” x 0.85” (30 x 23mm)Window Material: Shatter resistant laminate (3/16” thick)Field of View (100 yds): 30 yds (28m) at a 4” eye reliefStandard Reticle: 65MOA circle with quadrant ticks with 1 MOA aiming dot

ElectricalBrightness Adjustment Range: 110,000: 1 brightest to lowestNight Vision Brightness Range: 1000: 1 with NV switch engagedPower Source: 2 x 123 lithium batteriesBattery Life: 1100 continuous hours at nominal setting 12Brightness Settings: 30 settings with scrolling feature (10 settings for NV use)Auto Battery Check Indicator: Flashing reticle upon start-upAuto Shut-down: At 8 hrs- programmable to 4 hrs

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M552

OperationOptics: Transmission holography – 100% parallax freeMagnification: 1x Eye Relief: UnlimitedLength/Width/Height: 5”x1.8”x2.25” (131x49x60 mm)Weight: 11.5 oz (326 grams)Temperature: -40 to 150 F (using AA lithiums); -20 to 140 F (all other battery choices)Waterproof: Submersible to 33 ft depthSealing: Fogproof internal opticsColor/Finish: Non reflective black with hard coat finishAdjustment (per click): 0.5 MOA (1/2” at 100 yds)Adjustment Range: +/- 40 MOA travelMount: 1” Picatinny (MIL-STD-1913) rail Return to Zero: Repeatable to 1 MOA after re-mounting

Heads-Up-Display WindowOptical Surfaces: Anti-glare coatingWindow Dimensions: 1.20” x 0.85” (30 x 23mm)Window Material: Shatter resistant laminate (3/16” thick)Field of View (100 yds): 30 yds (28m) at a 4” eye reliefStandard Reticle: 65MOA circle with quadrant ticks with 1 MOA aiming dot

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ElectricalBrightness Adjustment Range: 110,000: 1 brightest to lowestNight Vision Brightness Range: 1000: 1 with NV switch engagedPower Source: 2x 1.5V AA batteries (supports lithium, alkaline, or rechargeable)Battery Life: 1,000 continuous hours (lithium) at nominal setting 12; 600 continuous with

AA alkalineBrightness Settings: 30 settings with scrolling feature (10 settings for NV use)Auto Battery Check Indicator: Flashing reticle upon start-upAuto Shut-down: At 8 hrs- programmable to 4 hrs

M551

OperationOptics: Transmission holography – 100% parallax freeMagnification: 1x Eye Relief: UnlimitedLength/Width/Height: 4”x1.8”x2.25” (102x49x60 mm)Weight: 8.8 oz (250 grams)Temperature: -20 to 140 F Waterproof: Submersible to 33 ft depthSealing: Fogproof internal opticsColor/Finish: Non reflective black with hard coat finishAdjustment (per click): 0.5 MOA (1/2” at 100 yds)Adjustment Range: +/- 40 MOA travelMount: Picatinny (MIL-STD-1913) rail Return to Zero: Repeatable to 2 MOA after re-mounting

<#7

Heads-Up-Display WindowOptical Surfaces: Anti-glare coatingWindow Dimensions: 1.20” x 0.85” (30 x 23mm)Window Material: Shatter resistant laminate (3/16” thick)Field of View (100 yds): 30 yds (28m) at a 4” eye reliefStandard Reticle: 65MOA circle with quadrant ticks with 1 MOA aiming dot

ElectricalBrightness Adjustment Range: 110,000: 1 brightest to lowestNight Vision Brightness Range: 1000: 1 with NV switch engagedPower Source: 2x N type 1.5V alkaline batteries (3.0V)Battery Life: 200 continuous hours at nominal setting 12Brightness Settings: 30 settings with scrolling feature (10 settings for NV use)Auto Battery Check Indicator: Flashing reticle upon start-upAuto Shut-down: At 8 hrs- programmable to 4 hrs

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1.4 Location and Description of Major Components

Fig 2: SU-231/PEQ (M553)

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Holographic Window - Contains the embedded holographic reticle pattern that forms a virtualimage of the reticle when illuminated by laser light.

Protective Hood - Preassembled, protective hood increases durability of sight housing andprotects the sight from impact damage.

Battery Latch - A cam lever that secures the removable battery compartment to the sight andprevents water, dirt, or grime from entering the battery housing.

Removable Battery Compartment - Protective housing that contains the power source for theHWS. The compartment is easily and quickly removed for the replacement of batteries.

Universal Mount - Integrated Picatinny (MIL-STD-1913) compatible rail.

Windage Adjustment - Adjusts the point of impact 1/2 MOA per click in a leftward and rightwarddirection.

Elevation Adjustment - Adjusts the point of impact 1/2 MOA per click in an upward anddownward direction.

On/Off, NV Mode, and Brightness Switches - Raised button control interface allows theoperator to perform and adjust user settings for appropriate and preferred conditions.

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2.0 OPERATING INSTRUCTIONS

This section describes the features and operating instructions of the M551, M552, and SU-231/PEQ (M553). Please read the instructions carefully before mounting and using thesight, and always practice proper firearm safety.

The Reflex Sight will include:

• Sight assembly• 2 x Type N alkaline (M551), AA alkaline batteries (M552), or 123 Lithium batteries (M553)• 7/64” Hex wrench (M551 and M552 only)• Knurled Picatinny Bolt (M551 and M552 only)• Technical Manual

2.1 Description of Components, Controls, and Indicators

The Reflex Sight uses a laser to illuminate a holographic reticle pattern embedded in the heads-up display window and forms a virtual image of a reticle pattern. The shooter looks through theheads-up display window and sees a bright red image of a reticle pattern projected onto thetarget plane. There is absolutely no light projected onto the target plane. The Reflex Sight hasno magnification.

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2.1.1 Hood

The Reflex Sight is equipped with a protective hood. This hood is pre-assembled at the factory.Should your hood require repair or replacement, please contact your unit armorer for repair,replacement, or turn in to the manufacturer (L-3 EOTech) for repair or replacement.

2.1.2 Batteries

Two (2) commonly available Type N 1.5 volt alkaline, AA 1.5 volt alkaline or 123 Lithiumbatteries power your Reflex Sight depending on the model. A set of batteries comes with yoursight. The Reflex Sight is designed to maintain constant brightness at a particular setting as thebatteries drain down. The reticle brightness will not fade gradually as the batteries run down,but rather, shut down abruptly. The first indication of the batteries draining is the reticle blinkingwhen the unit is turned on (see Electronic Features 2.1.4). Another indication of low batteriesis the reticle pattern blinking off and on during recoil. With high recoil guns, this can occurbefore the battery check indicates low battery condition. If the reticle pattern blinks off and onduring recoil or turns off suddenly, replace the batteries. Please read and follow the batteryreplacement and battery check procedures described in this Manual. Alkaline batteries fromdifferent manufacturers are not all constructed the same way. Tests show some brands aremore susceptible to degradation by the shock of recoil. We recommend the use of EvereadyEnergizer™ batteries with the Reflex Sight. It is always good practice to replace the batterieswith a fresh set before a mission.

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CAUTION - There is a 12 volt battery that is approximately the same size as the Type N1.5 volt alkaline battery used in the M551. DO NOT USE 12 V batteries in the M551. Theywill severely damage the sight.

Two AA size batteries power the M552. Two 123 size Lithium batteries power the SU-231/PEQ(M553). A set of batteries comes with the sight. Lithium AA batteries offer longer life, particularlyat temperatures below freezing. For this reason Lithium AA batteries are recommended for coldweather operations. However, it should be noted that the battery checking function, which isbased on the characteristics of alkaline batteries, does not operate properly when Lithium AAbatteries are used in the model M552 and may not indicate a low battery condition until verylittle battery life is left. The battery checking function of the M553 is designed only for the 123 Lithium battery and will function as described in section 2.1.2.

Figure 3:

Proper battery

Installation

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2.1.3 Replacing Batteries

Remove the battery compartment by lifting up on the locking cam lever and carefully sliding thebattery compartment away and up from the sight housing (Figure 3). After the batterycompartment is removed, slide the batteries out and replace them with a fresh set. The labelson the bottom of battery compartment show the correct battery orientation. Always make surethe gasket is free of dirt before the battery compartment is reinstalled or the water-proofing maybe compromised. To reinstall the battery compartment, point the sight towards the ground andslide battery compartment onto base. Make sure there is enough clearance between thecontact and the batteries to avoid bending the contacts. Hold the battery compartment downfirmly against the base and close the locking cam. Before you push down on cam lever,make sure the battery compartment sits all the way down and is parallel to the base.Verify correct battery installation immediately by turning on the sight and checking if theholographic reticle appears. If the batteries are left in the sight backwards, they will be drainedof their power.

Fig 4: Pushbutton interface

2.1.4 Electronic Features

All electronic controls are via pushbutton switches located at the rear of the unit housing asshown in Figure 4. To ensure proper operation of the pushbutton switches, press firmly on thecenter of the switch.

1. ON/ Auto Battery CheckPressing the Up or Down Arrow pushbutton switches will turn the sight ON at Level 12. Seeitem 4 under this section for a description of Auto shutdown. The sight will automatically performa battery check every time it is turned on. If the batteries have less than 20% of life left, the sightwill turn on with the reticle image blinking on and off for 5 seconds. If the remaining battery lifeis more than 20%, the sight will turn on with a steady reticle pattern. The battery condition canbe checked any time by turning the sight off and back on. The M553 reticle will blink when thebatteries have between 5 and 8 hours of useful life left.

2. OFFTo turn the sight off, simultaneously press both the UP and DOWN arrows. Verify that the sightis on by looking through the heads-up display window for the reticle.

3. Brightness AdjustmentPushbutton switches vary the brightness intensity of the holographic reticle pattern. Pressingand releasing the pushbutton switches moves the brightness level UP or DOWN one (1) stepfrom the previous setting. Pressing and holding the UP arrow or DOWN arrow switch will

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change the brightness level up or down continuously in steps. Twenty (20) brightness settingsprovide a dynamic range of 110,000:1 from the lowest setting to the highest setting.

4. Auto ShutdownThe Reflex Sight has an auto shutdown feature. If the sight is turned on by pressing the UP button,it will automatically shut itself OFF 8 hours after the last pushbutton control is used. The sightwill automatically shut OFF after 4 hours if it is turned on by pressing the DOWN button.

2.1.5 Night Vision Mode On/Off Auto Shutdown

The Reflex Sight is compatible with Generation II, III, III+ and IV+ Night Vision Devices. At thenight vision settings, the reticle brightness is low enough that when viewed with a night visiondevice, the reticle image does not bloom.

1. ON/ Night Vision Mode and 8 Hour Auto Shut DownPressing the NV Button (see Fig. 4) will turn the sight ON in Night Vision Mode. The sight willturn on at Level 4 and automatically shut off 8 hours after the last pushbutton control is used.There are 10 brightness settings in NIGHT VISION MODE with a dynamic range of 1000:1.

2. OFF/ Turning Sight OFFTo turn the sight off, press both the UP and DOWN arrows simultaneously. Verify that the sightshuts off by looking though the heads-up window with the night vision device.

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3. TOGGLE/ Between Normal and Night Vision ModesTo toggle between NORMAL and NIGHT VISION MODES, press the NV button. Whenswitching between modes, the sight will remember the last brightness setting. NOTE 3: Whenused with a Night Vision device, always check to make sure the sight is not turned on beforepressing the NV button to turn on the sight in the Night Vision mode. Otherwise, it will toggle tothe Normal mode and saturates the image intensifier.

2.1.6 Windage and Elevation Adjustments

Fig 5: Adjustments

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Your Reflex Sight features click mechanisms for elevation and windage adjustments. Theelevation and windage adjustment are located on the right-hand side of the sight (Figure 2). Theknob towards the front is the windage adjustment and the knob towards the rear is the elevationadjustment. Both of these adjustment mechanisms are grooved with a slotted screw head andrequire the use of a screwdriver, coin, or spent brass to turn. The elevation and windageadjustments are shown in Figure 5. For both elevation and windage, each click will change thebullet’s point of impact 1/2 Minute of Angle (MOA), 1/4 inch at 50 yards, or 1/2 inch at 100 yards.Also, one full rotation of either knob will change the point of impact 10 MOA, 5 inches at 50yards, or 10 inches at 100 yards. To move the point of impact UP, turn the elevationadjustment LEFT. To move the point of impact RIGHT, turn the windage adjustment RIGHT.

The Reflex Sight elevation and windage adjustments are factory collimated with the bore of therifle parallel to the mounting rail. The sight should be close to mechanical zero when mountedon a properly installed rail. Do not turn the adjustments before mounting the sight on thefirearm. Be sure to check that the mount and sight are securely mounted after initial firing

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CAUTION – There are 80 minutes of total windage and elevation (40 minutes in eachdirection) in the Reflex Sight. There are 80 1/2 min. clicks of adjustment from opticalcenter to the limits of windage and elevation adjustment. To establish optical/mechanicalzero, adjust turrets to limit, then return 80 clicks (do this for both the elevation and thewindage). When encountering an increase in resistance in adjustments, the end of theadjustment range has been reached. DO NOT turn the adjustments any farther, seriousdamage may occur to the sight.

2.2 Preventive Maintenance Checks and Services (PMCS)

OPERATOR LEVEL MAINTENANCE

The operator is limited to replacing batteries and cleaning the battery compartment and outerhousing surfaces of the sight.

REPLACING BATTERIES

See the heading ‘Replacing Batteries’ under section Description of Components, Controls, andIndicators. Do not use deteriorated or corroded batteries. Inspect batteries for rips, tears, orcuts in the housing. If there is any exposed, internal content of the battery, it could potentiallyeffect the operation of the sight.

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OPERATOR CLEANING INSTRUCTIONS

1. The optical system and the window are coated with anti-reflection material. When cleaningthe glass surfaces, first blow away any dirt and dust. Fingerprints and lubricants can be wipedoff with lens tissue or a soft cotton cloth, moistened with lens cleaning fluid or glass cleaner soldin any camera store. Never clean the glass surface with a dry cloth or paper towel; alwaysdampen the glass surfaces prior to cleaning.

2. No maintenance is needed on the sight’s surface, except to occasionally wipe off with a softcloth. Use only a water-based cleaner such as glass cleaner, ammonia, or soap and water.Never use any solvent-type cleaner such as alcohol or acetone. Do not use gun cleaner toclean or lubricate the Reflex Sight.

3. All moving parts of the sight are permanently lubricated. Do not try to lubricate them.

4. Never disassemble the sight’s optical assembly! The optical cavity is purged, nitrogen filled,and sealed to achieve fog proof performance. Disassembly will void the warranty anddamage the sight.

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2.3 Troubleshooting

The following section outlines measures the operator can take in the event of the named failure.

Failure: The sight will not power up:

Corrective Action 1: Ensure the batteries are inserted properly according to thediagram on the bottom of the battery cap.

Corrective Action 2: Replace the batteries with new, unused batteries that contain afull charge.

Corrective Action 3: Inspect the battery contact points in both the battery cap and onthe sight itself. These contact points are spring loaded and surrounded by a rubbergasket that may catch the spring. Move the contact points around and ensure they areat or above the surface of the rubber gasket.

Corrective Action 4: Reset the electronics by removing any source of power forapproximately two minutes. This will allow a capacitor in the electronics housing todrain of power, resetting the electronics. Reconnect the batteries and operate the sightas normal.

Corrective Action 5: Check the battery contacts for corrosion or wear. Clean the contacts.

Corrective Action 6: Turn in the sight for unit level maintenance.21

Failure: The reticle is fuzzy/ has a ‘halo’ effect/ has more than one reticle:

The reticle is naturally pixilated and the outer circle will appear to be made up of manysmall dots. The center circle will still be distinguishable as one dot.

Corrective Action 1: Lower the brightness level of the reticle. This fault is generallycaused by the reticle brightness being too high. The reticle is not designed to be sobright as to block the target.

Corrective Action 2: The reticle is projected onto your target plane. You must focus onit like you would any other object at that distance. Do NOT focus on the sight housinglike other reflex sights; focus on your target. The outer ring is designed to be areference to center, similar to a ghost ring.

Corrective Action 3: If you wear corrective lenses for nearsightedness, you will requirethem to see the reticle in focus, as it is projected onto the target plane. If you wearbifocals or have astigmatism, you may see a distorted reticle.

Corrective Action 4: Check with others who have used the sight, and compare whatyou see to ensure it is not your focal acuity prior to turning the sight in for repair.

Corrective Action 5: Turn the sight in for unit level maintenance.

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Failure: The reticle is flashing/ flashing on and off/ unit turns off during recoil:

Corrective Action 1: This is the low battery indicator. Replace the batteries.

Corrective Action 2: If the batteries are low, a high recoil weapon platform can causethe reticle to flash on and off, even before the low battery indicator takes effect.Replace the batteries.

Corrective Action 3: Replace the battery with Energizer brand batteries. These haveproven to be the most effective to withstanding a consistent amount of recoil. Manybrands of batteries deteriorate faster than others and can result in these failures.

Corrective Action 4: Turn the sight in for unit level maintenance.

Failure: There is a streak in the reticle/ the reticle is dim/ the reticle fades in parts of the window:

Corrective Action 1: Replace the batteries.

Corrective Action 2: Check with others who have used the sight, and compare whatyou see to ensure it is not your focal acuity prior to turning the sight in for repair.

Corrective Action 3: Turn in for unit level maintenance.

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Failure: I am missing a bolt/ have broken a bolt/ have broken a latch:

Corrective Action 1: Turn the sight in for unit level maintenance.

2.4 Unit Level Maintenance and Repair

The Unit Armorer or individual responsible for unit level maintenance is only authorized toreplace or repair the following items:

– Batteries– Battery Cap– Picatinny Bolt - Hex head– Picatinny Bolt - Knurled Thumb Screw– 7/64” Hex Wrench– Protective Hood and Hood Screws– Technical Manual

Please see Additional Authorized Items in Appendix A for the corresponding NSN numbers forthe above listed components.

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If the sight has been turned in for unit level maintenance that requires action in addition to theabove mentioned authorized repair or replacement items, the sight will need to be returned tothe manufacturer for the repair.

Contacting the manufacturer for repair:

1. Visit the manufacturer’s website at https://www.L-3com.com/eotech. Click on the CustomerService Tab in the menu bar and follow the instructions.

2. Call or email L-3 EOTech’s Customer Service Department at the following:(734) 741-8868 x3688general@L-3com.com

3. Be sure to leave a name, contact number, return shipping address, and failure descriptionin the email or on a voice mail. This will allow the manufacturer to generate a ReturnAuthorization Number (RA#) to include with the sight(s). DO NOT SHIP THE SIGHTSWITHOUT A RETURN AUTHORIZATION NUMBER (this will severely delay the turn aroundtime on repair or replacement).

4. If you require, fill out a DD Form 1149 to include with the sight(s) you will return. Include areference to the RA#, and a signature line for L-3 EOTech’s Service Department to signindicating the receipt of materials. The signed copy will be mailed, faxed, or emailed back toyou upon receipt of the sight(s) for the purposes of accountability.

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5. If the manufacturing date located on the bottom of the sight is more than two years old, afee will be assessed for repair to include the cost of both parts and labor. A purchase order willbe required to process the repair. Please contact L-3 EOTech for an estimate.

Please send the unit postage prepaid, to address listed in Appendix B. Please include yourname, address, telephone number, and a written description of the problem you areencountering, and also include the RA #. Whenever possible, ship the sight in its original box.

2.5 Installation of Equipment

MOUNTING

The Reflex Sight is equipped with mounting hardware to attach to a MIL-STD-1913 Picatinnystyle rail. To achieve the best results and accuracy, the HWS must be mounted properly. ThePicatinny rail needs to be as parallel as possible to the bore to permit the maximum elevationand windage adjustments. If it is required, it is strongly recommend that the Picatinny rail beinstalled by a qualified gunsmith. To mount the sight, please follow these steps.

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Models M551 and M552:

1. Locate the post and Picatinny clamp on the underside of the sight. Loosen the hex bolt andthe Picatinny locking bar with the hex wrench (7/64”). If using the Knurled Picatinny Bolt, firstremove the hex bolt by completely unscrewing it from the locking bar and replacing it with theKnurled Picatinny Bolt.

2. Place the bolt within a groove on the top of the Picatinny rail. Individual preference and thespecific firearm determine the optimal positioning to any specific groove on the Picatinny rail.

3. Make sure the bolt is inserted fully into the rail’s groove and push the sight as far forward aspossible. Tighten hex bolt and retainer screw if using the hexbolt. If using the Knurled PicatinnyBolt, rotate the bolt until resistance is felt. Using a coin, screwdriver, or other type of flat tool,rotate the bolt head an additional 3/4” turn to fully tighten.

NOTE 1: Loosen bolt just enough to mount and dismount the sight. Do not back bolt outcompletely to avoid losing the Picatinny locking hardware.

NOTE 2: A Picatinny rail cannot be installed directly on some weapons. L-3 EOTech sells mountadapters to provide a standard Picatinny rail for various weapons used in today’s military andlaw enforcement applications. Contact a Factory representative if you are unclear on themounting adapter you should use on your weapon.

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Model SU-231/PEQ (M553):

1. Pull and turn the two throw-levers so they are away from their closed and nested position inthe base of the sight. This will turn the securing lip of each throw lever outward and allow thesight to mount onto the rail.

2. The sight contains a small post that rests in the groove of the Picatinny rail. Move the sightto the position desired on the rail and allow the post to rest fully in the closest groove.

3. Push the sight as far forward as possible and close both of the throw-lever arms so they arefully shut and nested in the base of the sight.

2.6 Zeroing Procedures

Once the weapon’s iron sights have been zeroed, please refer to the section on Windage andElevation Adjustments (Section 2.1.6) to zero the Reflex Sight. The following are someadditional reference aids that can be used during the zeroing process.

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BORE SIGHTING

Bore sighting is a good preliminary procedure in achieving proper alignment of your sight to thefirearm. A chamber laser/ bore sighter is an aid in achieving collomation.

LIVE FIRE SIGHTING FOR AN M-4 OR M-16

To employ the aiming dot of the Reflex Sight reticle from 10 to 300 meters, the sight can bezeroed at 25 meters using a standard M4/M16 military zeroing target. With the dot aimed atcenter mass of the target, the sight should be adjusted so the round lands approximately 1 cmbelow the point of aim at 25 meters. This method of zeroing ensures hitting a target at 100-200meters where fine tuning should be conducted.

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Additionally there are custom targets for 25m zeroing used with the M-4 and M16 (see Figure6), and for Laser Bore Sighting (see Figure 7). Please visit the manufacturer’s website atwww.L-3com.com/eotech or contact the manufacturer for copies of these targets

Figure 6: M-16/M-4 ZERO TARGET

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Figure 7: Laser Bore Sight for M4/M16

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RANGE ESTIMATION WITH UNMAGNIFIED HOLOGRAPHIC WEAPON SIGHT

Range estimation can be done with different portions of the projected reticle, such as the centerdot or the ordinal points. Illustration (Figure 9) of range estimation with the DOT reticle. Theaiming dot will displace a one inch area on the target at 100 yards, two inches at 200 yards,three inches at 300 etc. At 400 yards, an automatic ballistic compensation is accomplishedsimply by placing the aiming dot at the top target’s head. With the heavy bullet loads for theM-4 A1/ MK 12, the bullet will drop to approximately the center of torso with a 100 meter zero.

Figure 9: Range Estimating with the HWS

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3.0 MOUNTING SOLUTIONS

There are numerous configurations with which to employ the Reflex Sight. The M552 and M551Reflex Sight come with an integrated Picatinny MIL-STD-1913 mounting rail adapter that willmount to any Picatinny style or 1” dovetail type rail (please see section 2.5 Installation ofEquipment).The SU-231/PEQ (M553) mount is specifically designed for the Picatinny (MIL-STD-1913) mounting rail. Certain commercial variants of the MIL-STD-1913 railspecification may not be compatible with its mounting assembly. The SU-231/PEQ (M553) baseconsists of (2) ARMS® throw levers and is only adaptable to rails that properly accept theARMS® design

This chapter outlines available options which can be based on the type of weapon platform orpersonal preference. Many of the mounting solutions pictured are available directly through themanufacturer. Please contact the factory if you have any questions regarding configurations,orders, or availability (please see Appendix B for factory contacts).

NOTE: The Reflex Sight is fully compatible with all Machine Gun Platforms, as well. Thisincludes the M249 SAW, M240 series, and the M2 series machine guns.

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3.1 M4/M16 Flat Top Co-witness:

This configuration positions the sight in front of a flip-up rear iron sight. Allows for co-witnessingand also allows the shooter to maintain cheek-weld (Figure 10).

Figure 10

3.2 M4/M16 Adjustable Cantilever Mount:

Co-witnesses with iron sights andmaintains cheek-weld. The mount has anadjustable height at the drop or ‘goose-neck’, forward of the carry handle. Themount attaches with a nut to carry handle.Works with fixed-carry handles (Figure 11).

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Figure 11

3.3 M4/M16 Fixed Cantilever Mount:

Co-witnesses with iron sights and maintains cheek-weld. The cantilever mount attaches with a finger operated nut to the carry handle. Works with removable carry handles and fixed (Figure 12).

Figure 12

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3.4 M4/M16 Carry Handle Mount:

This mount positions the Picatinny rail on top of the carry handle. Maintains access to ironsights and has extended rail for night vision systems. Works well with gas masks or peripherals(Figure 13).

Figure 13

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3.5 HK Low Profile:

Low profile positioned mount for MP5, 33, 53, 91, 93, 94, and G3. Maintains cheek-weld andsupports night vision operation (Figure 14).

Figure 14

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3.6 HK Mid Profile:

Mid profile positioned mount for MP5, 33, 53, 91, 93, 94, and G3. Maintains access to ghostrings and supports NV operation (Figure 15).

Figure 15

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3.7 Tactical Shotgun Mount:

This is a saddle mount that requires no tapping. It is made for a Remington 870, 1100, 11-87.Other models are available for the Mossberg 500 and Benelli M-1 Super 90 (Figure 16).

Figure 16

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3.8 Sig SG-550 Mount:

Reflex Sight mounts at a low profile on the weapon’s receiver. No access to iron sights. The railmounts under the diopter and bolts to the side of the upper receiver (Figure 17).

Figure 17

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3.9 FN FAL Mount, Para Version Available:

Reflex Sight is mounted at a low profile. The mount replaces the dust cover. No tappingrequired. No access to iron sights (Figure 18).

Figure 18

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3.10 PVS-14 Ring and Mount:

A mounting platform for the PVS-14 NV system behind the Reflex Sight. Base mounts toPicatinny rail and ring to NV tube. Ring has QD lever for fast removal. Also available for Litton983 NV tubes (Figures 19, 20).

Figure 19 Figure 20

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3.11 AK-47 Mount:

Reflex Sight mounts at low profile. Rail slides over gas tube near rear sight aperture. AK type/barrel diameter needs to be specified. No access to iron sights (Figure 21).

Figure 21

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4.0 APPENDIX A: Components of End Item

4.1 BASIC ISSUE ITEMS: M551, M552 ONLY

M551, M552, qty. 1 Part N2075: Picatinny Bolt, hex head; qty 1(M552 Pictured)

(NSN 5306-01-510-8739)(M552 NSN 1240-01-492-5264)(M551 NSN 1240-01-485-0441)

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Part N2076: Picatinny Bolt, Knurled Part N5800: Hex Wrench, 7/64; qty 1Thumbscrew; qty. 1

(NSN 5305-01-510-8739) (NSN 5120-01-510-9374)

Part N/A: Military Technical Manual; qty. 1

(NOT PICTURED)

(NSN Not Available, Contact ManufacturerFor Replacement; see Appendix B)

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BASIC ISSUE ITEMS: SU-231/PEQ (M553) ONLY

SU-231/PEQ (M553), qty. 1

(SU-231/PEQ (M553) NSN 1240-01-533-0941)

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Part N/A: Military Technical Manual; qty. 1

(NOT PICTURED)

(NSN Not Available, Contact ManufacturerFor Replacement; see Appendix B)

4.2 REPLACEMENT ITEMS (Not All Items Below are Pictured)

Part number Description NSN(for GSA orders)

CR2022 Battery Cap – 123 Lithium Battery Style n/a N1044 Battery Cap – N style batteries n/aN1045 Battery Cap – AA batteries 6160-01-510-8734N2075 Picatinny Bolt – Hex head 5306-01-510-8735N2076 Picatinny Bolt – Knurled head 5305-01-510-8739N5252A Retaining Washer, Nylon n/aN2020 Picatinny Locking Bar n/aN5800 7/64” Hex wrench 5120-01-510-9374N2053 Hood For Model 552, 551 1240-01-510-8748CR2053 Hood For 553 n/aN1101 Hood Screws (5 screws) n/aN7752 Type N Battery Set (2 batteries) n/aCR7751 123 Lithium Batteries (2 batteries) n/a

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Type N Batteries(1.5v alkaline)for Model M551Part N7752

Battery Cap for Model M551N Style BatteriesPart N1044

7/64” Hex wrenchfor Models M551,M552Part N5800

Picatinny Bolt - Hexhead for Models M551,M552Part N2075

Battery Cap for Model M552:AA BatteriesPart N1045

Picatinny Bolt - knurledhead for Models M551,M552Part N2076

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Hood Kit forModels M551and M552Part N2053

Hood Screws forall models(includes 5)Part N1101

PicatinnyLocking Bar forModels M551, M552Part N2020

Nylon retainingwasher for knurledpicatinny boltPart N5252A

Hood for ModelSU-231 (M553)Part CR2053

Battery Cap for Model SU-231 (lM553):CR123 BatteriesPart CR2022

5.0 APPENDIX B: Factory Contacts

Customer Service/Repair ....................................................(734) 741-8868 Option #8

Technical Sales/Service .......................................................................(734) 572-2170

Shipping Address:L-3 EOTech Inc.1201 E. Ellsworth RoadAnn Arbor, MI 48108USA

EMAIL ........................................................................................general@L-3com.com

Visit us on the web................................................................www.L-3com.com/eotech

OUR PRODUCT IS PROUDLY MANUFACTURED IN THE UNITED STATES OF AMERICA

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