Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts.
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 QC10 Builders kit is for the customer that realizes the importance of high quality matching core components. The kit includes a QC10 lower and upper receiver with proprietary parts, a barrel of desired length with a patented bolt and an adjustable buffer assembly. This represents the essential bones of a great pistol/carbine build and the reassurance that the parts contained within the kit are made for, not modified, the chosen pistol caliber.
Builder's Kit includes the "bones"- the core components for building your own Quarter Circle 10 Carbine or Pistol
QC10 Stripped Rider (Colt SMG) Lower Receiver with proprietary parts
QC10 Billet Rear Charging Upper Receiver
9x19mm barrel in your choice of 5.5", 7.5", 10.5", or 16" length
Patented Universal 9MM Bolt Assembly
QC10 Adjustable Buffer Kit
Made For the AR Platform- Not Modified
Any orders containing lower receivers require a verified FFL dealer to make the transfer.
Lower receivers will not be shipped until QC10 has your dealer's license on file.
Please contact your desired dealer about sending us a copy of their license.
CALIFORNIA BUYERS: Please check with your transferring dealer before ordering. Many CA dealers are unwilling to process lower receiver transfers.
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.