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.

Blu Whistler (P320) Receiver Set- Side Charging

Availability: In stock
Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts.
Special Price $476.95 was $529.99

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.

The QC10 receiver set represents the bare essentials for a quality pistol/carbine build. The stripped lower and upper with proprietary parts form a solid foundation from which to completely customize a pistol or carbine. Some customers purchase this kit as an upgrade to their existing platforms, while others try their hand at matching the performance of a QC10 full build with other components. Regardless, the QC10 Receiver kit ensures the heart of the build is American. Made for, not modified, with a connection to Texas that no one else can match.

QC10 Stripped P320 Lower Receiver with proprietary parts

Accepts mil-spec receiver extension (buffer tube)

QC10 Side Charging Upper Receiver with Gibbz Arms Technology 

Latching, Non-Reciprocating Charging Handle

Engineered for 9mm Sig P320 Magazines

Accepts QC10 Universal 9MM Bolt Assembly

Type III Hard Coat Anodizing

No Lower Parts Kit installed

Made For the AR Platform- Not Modified

The QCP320 does not have provisions for Last Round Bolt Hold Open. 

Handguards with overlapping anti-rotation tabs may not be compatible with QC10 billet upper receivers, including Side Charging uppers.

**GIBBZ Arms Patented Left Side Charging Handle Pat. No. 9,310,146

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.