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COPYRIGHT © 2017, QUARTER CIRCLE 10, LLCALL RIGHTS RESERVED
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Quarter Circle 10
RiderUsers Manual
9x19mm5.5” - 7.5” - 10.5” - 16.0”
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firearm recordModel: ___________
Serial No.: ___________
Purchase Date: ___________
Order No.: ___________
forewordRead and understand the entirety of this manual before handling your firearm. Keep this firearm and all firearms out of reach of children. Keep it in a safe place and make sure it is unloaded. Failure to do so could result in serious injury or death.
This document was created to help you familiarize yourself with general safe operating and handling procedures for Quarter Circle 10 Pistol Caliber Carbine platforms.
This document does not replace proper firearm instruction from a certified instructor. This manual is not meant to teach any aspect of target shooting, safe hunting practices or how to defend yourself with a firearm.
This is an auto loading, semi-automatic firearm. As such, a round is loaded and ready to fire again after each pull of the trigger. Removing the magazine from the firearm does not engage a safety. The firearm is not considered unloaded until the magazine is removed and the chamber is visually checked to be empty. When visually checking, always look through the chamber end to the muzzle. Never look down the end of the barrel.
Contact Quarter Circle 10 immediately if any part of this document is unclear, before operating and handling any Quarter Circle 10 product.
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Contents
Basic Safety Rules
Technical Specifications
Firearm Terminology
Safety Function Check
Legal Information
Loading & Firing
Disassembly
Troubleshooting
Pistol Stabilizing Brace
Parts Diagram
Lifetime Guarantee
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basic safety rules• Treat every weapon as if it were loaded.• Never point a weapon at anything you do not intend to
shoot.• Keep your finger off the trigger until ready to fire.• Keep the weapon on “SAFE” until you intend to fire.
Additional Safety rules• Always unload all firearms when not in use.• Do not rely on the firearm’s safety selector.• Know your target and what is beyond it.• Know how to use the gun safely before attempting to use.• Be sure the gun is safe to operate. If your gun fails to fire
when the trigger is pulled, handle with extreme care.• Use only the correct ammunition for your firearm. The
caliber is engraved on the top of the barrel near the muzzle.• Wear eye and ear protection at all times when using this
firearm.• Never use alcohol, over-the-counter, prescription or
recreational drugs before or while shooting.• Store firearms where they are not accessible to
unauthorized persons or children.• Be sure the barrel is clear of obstructions before shooting.• Do not alter or modify your firearm• Have your firearm cleaned and serviced regularly.• Learn the mechanics and handling characteristics of your
firearm.
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technical specificationsModel:
Operation:
Magazine Capcity:
Ammunition:
Trigger Weight:
Approx Weight:(with empty
magazine)
Overall Length:
Barrel:
Materials and Finish:
CLT9mm
Semi-Automatic, Magazine Feed, Mass Delayed Blowback
32 rounds
9x19mm, 9mm Parabellum, 9xmm Luger, 9mm NATO
Approx. 5 lbs
5.5” - 5 lb 10 oz7.5” - 5 lb 14 oz10.5” - 6 lb 5 oz16.0” - 6 lb 8 oz
5.5” - 22.5”7.5” - 24.5” 10.5” - 27.5”16.0” - 34.0”
1:10 RH Twist 6 Grooves
Lower Receiver 7075-T6511 Aluminum - Anodized Type IIIUpper Receiver 7075-T6511 Aluminum - Anodized Type IIIHandguard 6061-T6511 Aluminum - Anodized Type IIIBolt 8620 Steel - Melonite QPQBarrel 4150 Steel - Melonite QPQ
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firearm terminology
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safety function check– UNLOAD FIREARM – REMOVE MAGAZINE– CHECK CHAMBER
1.. Remove magazine, if installed. Pull charging handle assembly to the rear. Check that chamber is, in fact, clear. Let bolt close. Do not pull trigger. Leave hammer in cocked position.
WARNING: If firearm fails any of the following tests, continued use of the firearm could result in injury or death.
2. Place safety selector in SAFE position ( ) and pull trigger. The hammer SHOULD NOT fall.
3. Place safety selector in FIRE position ( ) and pull trigger. The hammer SHOULD fall.
NOTE: For the purpose of the following check, “Slow” is defined as one fourth to one half the normal rate of trigger release.
4. Hold trigger to the rear, pull charging handle to rear, and release handle. Release pressure on the trigger with a slow, smooth motion, without hesitation or stops, until the trigger is fully forward. An audible click should be heard. The hammer SHOULD NOT fall.
5. Repeat the FIRE position test five times. The firearm must not malfunction during any of these five tests. If the firearm malfunctions during any of these five tests, contact Quarter Circle 10 or have the firearm checked by a qualified gunsmith.
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Firearm LawsFirearm laws and legislation are vast and vary from city to city, and state to state. It is your responsiblity to know these laws.
Obey all City, State and Federal firearm laws when storing, transporting and using your firearm.
Liability exclusionsIf the firearm is disassembled or altered by the user, or by any third party, other than as described in this manual, any and all warranties, related to this firearm are void. Quarter Circle 10, LLC is not responsible for loss, damage or death due to incomplete reassembly, damage or modification of this firearm. Any modification, alteration or change to the safety features of this firearm are strictly prohibited and preclude use of the weapon.
Quarter Circle 10, LLC is not liable for misuse, negligence, gross negligence, use under the influence of drugs or alcohol, modifications, or careless handing.
Quarter Circle 10, LLC is not liable if the firearm is fired using any ammunition other than commercial first run manufactured ammunition of the proper caliber specified on the firearm. The use of non-standard, modified, or reloaded ammunition voids any warranty of Quarter Circle 10, LLC.
Quarter Circle 10, LLC has done extensive research and development on all parts and products on your firearm to ensure it performs properly as sold. It is your duty to verify that any new parts are installed correctly by a certified gunsmith. If unsure about component compatibility, consult Quarter Circle 10, LLC before making modifications.
NOTE: All liability is excluded in the event that the instructions and information in this manual are not observed.
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Fired cartridge caseInluded in your purchase is a cartridge case that was fired from your firearm before leaving our manufacturing facility. Some states and local jurisdictions now require that all manufactured pistols must be accompanied by a cartridge case. This case must be fired from the firearm at the factory. The case must then be placed in a sealed container bearing certain information concerning this test catridge.
At the point of sale and transfer, firearms dealers must forward this test cartridge to a designated destination. As Quarter Circle 10 sells and ships firearms nationwide, we include a fired cartridge case with each Pistol Caliber Carbine, in an effort to maximize compliance with changing gun laws.
If you are a Quarter Circle 10 customer who does not live in an area where these laws and regulations are required, rest assured that the included cartridge case you received is proof that your new Quarter Circle 10 firearm has undergone our normal test firing procedures and meets or exceeds our specifications.
Included in your purchase is a keyed, cable lock to provide a secure solution to disabling firing the weapon when not in use. Firearms should always be locked and stored in complete compliance with all applicable laws and regulations.
1. Keep muzzle pointed in a safe direction with your finger off the trigger.
2. Without a magazine inserted, use the charging handle to pull the bolt towards the rear. Manually engage the bolt catch and return the charging handle forward.
3. Pass the cable lock through the ejection port until it protrudes from the magazine well. Take the cable end and place it into the lock body.
4. Pull cable lock to ensure proper engagement. Store key separate from locked firearm. Keep key and firearm out of reach of children and those not authorized to pocess and handle a firearm.
5. Keep key and firearm out of reach of children and those not authorized to possess and handle a firearm
firearm cable lock
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loading a magazineCAUTION: Safe firearms handling dictates that you only load live ammunition into your magazine and firearm when you are ready to shoot.
1. When loading your magazine, take care to inspect every cartridge inserted for defects, to include dents, scratches, bullet seat depth, and primer depth. Do not load damaged ammunition. Do not load any ammuni-tion that has previously misfired.
2. With the magazine facing forward, as shown in the illustration, place a round between the lips of the magazine with the bullet forward and primer towards the rear.
3. While pressing down on the magazine follower, or previously loaded round, insert the new round into the magazine.
4. 9x19mm ammunition has a tapered case. With the straight profile of the Colt SMG magazine, it is necessary to push each round rearword until flush with the rear panel. Give the magazine a slight tap on the back panel to ensure proper seating, as rounds continue to be loaded.
5. Observe the view port windows for round count. Do not exceed the round limit due to increased risk of failure to feed and other malfunctions.
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loading the firearm1. Remove empty magazine by depressing the magazine catch, located on the right side (ejection port) of the lower receiver. Maintain control of the magazine while removing it from the firearm. Colt SMG magazines are rolled steel construction and are highly durable, but unneccessary impacts can lead to malfunction.
2. Depress the lower tab of the bolt catch in towards the lower receiver, while pulling the charging handle to the rear. The bolt will be held in place by the bolt catch, when this occurs return charging handle to forward position until it is locked in place.
This action charges the firearm, allowing it to be placed on “SAFE.”
3. Using the selector lever tab, located on the left side of the receiver place the firearm in the “SAFE” position ( ). This will stop the trigger from being able to be pulled rearword.
4. Take a loaded magazine, and with the bullet facing forward, insert the magazine into the magazine well, pushing upward until it is seated and locked into position. Tap the bottom of the magazine to ensure it is seated fully. Pull down on the magazine to ensure it is fully engaged and will not become dislodged from the firearm during operation.
Note: Fully loaded magazines will not seat properly if the bolt is forward. Ensure the bolt is locked to the rear when attempting to load a magazine at its capacity.
5. While maintaining muzzle awareness and keeping fingers clear of the ejection port, trigger and trigger guard, depress the top pad of the bolt catch. This will release the bolt forward, chambering a round.
Warning: The firearm is now loaded with a live round in the chamber and the hammer is cocked. Take care in handling and placement of fingers with a loaded firearm.
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WARNINGDo not chamber a round until you are ready to fire your firearm. Keep the muzzle pointed in a safe direction. Do not place the safety selector on “FIRE” until you intend to fire. Always wear eye and hearing protection when firing your firearm.
1. With a loaded firearm and the safety selector on “SAFE,” place one hand around the handguard while the other hand firmly grasps around the pistol grip. Ensuring that your index finger is straight and off the trigger.
2. Check that the down range area is clear. Using the thumb of the hand wrapped around the pistol grip, rotate the safety selector switch upright to the “FIRE” position.
3. Place your index finger on the trigger. Gently pull towards the rear until the hammer releases and the firearm fires. Release the trigger. The fired cartridge case will be ejected and a new round will be loaded from the maga-zine. This action can be repeated until the magazine is empty.
4. When firing has stopped, keep index finger away from trigger. Using thumb, place safety selector to the “SAFE” position. A live round will be in the chamber ready to fire if the magazine is not empty. If the last round of a magazine has been fired, the bolt will be locked to the rear.
5. The magazine can now be removed by pushing the magazine release button. To continue firing insert a loaded magazine.
firing the firearm
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1. Set the safety selector to the “SAFE” position ( ).
Note: If the hammer is forward, the safety selector will not be able to be placed in the “SAFE” position. Charging is needed to “cock” the hammer, allowing the firearm to be placed on “SAFE.”
2. Depress the magazine catch and remove the magazine.
3. Pull the charging handle to the rear, while pressing the lower tab of the Bolt Catch inward. If a round was in the chamber, it will now be ejected.
Note: If the last round of the magazine was fired the bolt will be held to the rear.
4. While maintaining proper muzzle awareness, look through the ejection port and visually inspect that the chamber is empty.
5. With the magazine removed from the firearm, and the chamber empty, depress the top tab of the bolt catch to release the bolt forward.
Unloading the firearm
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WARNINGVisually inspect that the firearm is unloaded. Remove magazine from firearm for disassembly.
NOTE: It is advised to disassemble on a table top to avoid losing any small parts held under spring tension.
ITEMS NEEDED: (1) 1/8” Punch, (1) 1 / 16th Hex Key
1. Push the takedown pin from the left side of the lower receiver to its full extended position. Pivot the upper receiver from the lower receiver.
2. Push the front pivot pin from the left side of the receiver to its full extended position. Separate the upper and lower receiver assemblies.
3. Ensure hammer is in the cocked position. Depress buffer retaining pin with a punch. Buffer is under spring tension. Remove buffer and buffer spring.
4. Turn the upper receiver upside down. Pull charging handle and bolt assembly to rear. Remove bolt assembly from upper receiver, set aside. Lift and remove charging handle.
DISASSEMBLY OF FIREARM
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5. Remove firing pin retaining pin from bolt assembly. Firing pin is under spring load and will pop out if not retained. Do not bend or open split end of retaining pin.
6. With a 1/16th hex key, remove the threaded pin holding the extractor together. Remove spring and rubber detent. For reassembly, note that the extractor spring is tapered. The larger diameter goes into the extractor.
NOTE: Further disassembly is not advised. If further disassembly is needed, contact Quarter Circle 10 technical support for instructions.
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troubleshootingPROBLEM
Won’t Fire
Won’t Feed
Won’t Extract
Won’t Chamber
Double Feed
Bolt not locked on last round
CAUSE
Selector Lever on SAFEImproper assembly of BoltExcessive carbon on Firing PinLight primer strike
Dirty or damaged ammoMagazine not fully seatedDefective magazineToo many rounds in MagazineDirty Buffer Assembly action
Borken Extractor SpringDirty or damaged ammoCarbon buildup in Extractor lip
Dirty or damaged ammoExcessive carbon in chamberDirty Bolt Assembly
Defective Magazine
Dirty Bolt CatchFaulty MagazineDirty BHO bar
SOLUTION Place on FireAssemble correctlyCleanClean, check ammo to SAAMI specs
DiscardTap bottom of magazineReplaceRemove excess roundsRemove Buffer and Spring, Clean
ReplaceManually Remove stuck roundClean
DiscardCleanDisassemble, Clean, Assemble, Lubricate
Replace
CleanReplaceClean
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The Quarter Circle 10, LLC Pistol Brace is intended to improve accuracy by using the operator’s forearm to provide stable support for the AR style pistol. The ATF has previously determined that attaching the brace to a firearm does not alter the classification of the firearm or subject the firearm to National Firearms Act (NFA) control.
However, this classification is based upon the use of the device, as designed. When the device is redesigned for use as a shoulder stock, on a pistol, with a rifled barrel under 16 inches in length, the firearm is properly classified as a Short Barreled Firearm under the National Firearms Act.
The intent of the Pistol Stablizing Brace is to facilitate one handed firing of the AR pistol for those with limited strength or mobility due to a handicap. It also performs the function of sufficiently padding the buffer tube in order to reduce bruising to the forearm while firing with one hand. Sliding and securing the brace onto ones forearm and latching the Velcro straps, distributes the weight of the weapon evenly and assures a snug fit. Therefore, it is no longer necessary to dangerously “muscle” this large pistol during the one handed aiming process; recoil is dispersed significantly, resulting in more accurate shooting without compromising safety or comfort.
pistol stablizing brace
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At Quarter Circle 10, we take great pride in being THE AR15 Pistol Caliber BRAND. We are dedicated to providing our shooters with the highest quality product available. Every Quarter Circle 10 product available comes with a lifetime guarantee.
LIFETIME GuaranteeThe Quarter Circle 10 Lifetime Guarantee applies to all physical goods purchased from Quarter Circle 10, LLC.
What does the Guarantee Cover?
The Quarter Circle 10 Lifetime Guarantee covers any defects in material or workmanship under normal use for the duration of ownership. This warranty does not include normal wear and tear associated with extended use of the Product(s).
What will we do to correct the problem(s)?Quarter Circle 10 will either repair or replace the product at no charge, using new or refurbished replacement parts.
How long does the coverage last?Your Quarter Circle 10 product(s) are guaranteed for the duration of ownership. If you are a Quarter Circle 10 dealer or reseller, the guarantee is extended to your customer.
What is not included in the Lifetime Guarantee?• Conditions, malfunctions or damage unrelated to defects in material or
workmanship.• Products modified to specifications not endorsed by Quarter Circle 10.• Lost or Stolen Parts
LIFETIME GUARANTEE
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What do you have to do?To obtain guarantee service, inform Quarter Circle 10 of the problem, by sending an email to [email protected] or calling Quarter Circle 10 directly at (520) 269-6464. This allows us to properly assess the issue and determine the appropriate solution to your problem. If a repair or replacement product is needed, you will be given detailed instructions on how to proceed.
NOTE: It is illegal to ship a firearm with ammunition in the firearm or in the same package. If Quarter Circle 10 deems it necessary for you to send both the firearm and ammunition it must be shipped separately.
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SHOOTER NOTESDATE NOTES AMMO
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SHOOTER NOTESDATE NOTES AMMO
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