Shipping: All orders are shipped within 72 hours Monday -Thursday 6am - 4pm Arizona Time.
Any order containing a lower receiver will not be shipped until we receive a copy of your FFL. Once received regular shipping policies apply. Submit your FFL Here.
Returns: Quarter Circle 10 offers a 30 day return, refund and exchange policy. See Details.
The outstanding feature of the QC5 is that it is made for the use of 9x19mm MP5 magazines. Available in a full range of hand guard and barrel lengths in either a rear or side charging receiver. Users appreciate that in a QC10 complete build, all components are made for, not modified to work together. This dependability is further strengthened by a life time warranty and dependable customer service.
Engineered for 9x19mm MP5 magazines
Mil-Spec Lower parts
Tested Buffer Tube, Spring and Weight and SB Tactical A3 or PDW brace
Milled billet 7075-T6 Aluminum Lower Receiver
QC10 Milled billet 7075-T6 Aluminum Rear Charging Upper Receiver
Type III Hard Coat Anodizing
Made For The AR Platform- Not Modified
Choice of barrel lengths & matching MLOK handguard
Endless customization options
Test fired before it leaves the factory
Includes Carrying Case
Quarter Circle parts are designed to work within mil-spec perimeters. However, for optimum performance we recommend using QC10 parts for all your core elements, (receivers, bolt, barrel and adjustable buffer system).
Made for- Not Modified. Every QC10 product is engineered specifically for pistol caliber ammunition, not modified from an existing platform, increasing functionality, reliability and overall performance.
Important Warranty Note:
If you intend to register your Quarter Circle 10 firearm as an NFA weapon, test it thoroughly before doing so in a Title 1 Configuration. Once you Form 1 or Form 2 it, you are legally the manufacturer, and we cannot service the firearm. Should your firearm require warranty replacement we can only replace it with a Title I receiver and we are not responsible for tax stamps or NFA fees.
All orders containing a complete pistol must be shipped by 2 Day Air to a licensed, Federal Firearms Dealer (FFL). Please have your FFL email us a copy of their current Firearms license. Orders cannot be shipped without one.