Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. GSF Parts Kit
Call (520)269-6464 for availability
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.
Includes all GSF proprietary parts
Last Round Bolt Hold-Open Arm
Bolt Catch Spring
Magazine Release Spring