Due to ATF final rule 2021R-08F, all Quarter Circle 10 Full Pistol Builds will no longer come with pistol braces installed or included.
Please contact us if you have any questions before ordering.

Rider (CLT9MM) Complete Lower W/ SB PDW Brace

Availability: In stock
Quarter Circle 10, The AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts.

Shipping & Returns

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.

Holiday Shipping: The QC10 Shop is closed from December 223rd-January 2nd. During this time, shipping will also be closed. You order will be processed on Jauary 2nd and will ship out the same or next week. Please double check your shipping information as well as get your FFL info in so that your order will not be delayed. 

Returns: Quarter Circle 10 offers a 30 day return, refund and exchange policy. See Details.

A tough PCC complete lower made for Colt SMG 9mm magazines. With traditional looks the Rider is a favorite of competition shooters and those who want to celebrate American design in its entirety. QC10 delivers the shooter a premium product and a connection to the USA that others simply do not have.

• Engineered for Metalform Colt 9mm SMG Magazines

• SB Tactical PDW brace

• Mil-spec Receiver Extension (Buffer Tube)

• Mil-spec Lower Parts Kit

• Enhanced Mil-spec fire control group

• Magpul MOE grip

• Ambidextrous Safety

• QC10 Adjustable Pistol Caliber Buffer System

• Springco XP (Red) AR-15 Buffer Spring

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.