9MM Universal Bolt Assembly


Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. 9MM Universal Bolt Assembly

In stock (can be backordered)


Advanced blowback design

Manufactured to function reliably with any QC10 9mm platform. Glock, Sig226, MP5, and CLT9MM magazines supported.

Drop-in Installation

8620 Steel Bolt

QPQ Nitride treated for maximum durability and wear resistance.

Heavy Duty Extractor

Removable mass


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