Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. 9MM Universal Bolt Assembly
Shipping: All orders are shipped within 72 hours Monday - Friday 8am - 5pm PST
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.
Advanced blowback design
Manufactured to function reliably with any QC10 9mm platform. Glock, Sig226, MP5, and CLT9MM magazines supported.
8620 Steel Bolt
QPQ Nitride treated for maximum durability and wear resistance.
Heavy Duty Extractor