Advanced Blowback Design

Engineered to function specifically with Glock .45 ACP magazines and ammunition. 

Patented bolt face and extractor geometry for optimum performance and reliability. 

Drop-In Installation

Heat Treated  8620 Steel Bolt

Hard Chrome Firing Pin

QPQ Nitride treated for maximum durability and wear resistance.

Heavy Duty Dedicated .45ACP Extractor

Removable Bolt Mass

Threaded Extractor Retaining Pin

15 oz. Assembled Weight

Quarter Circle parts are designed to work within mil-spec perimeters.  However, for optimum performance we recommend using QC10 parts for all your core elements, (Receivers, bolt, barrel and adjustable buffer system). 

Made For - Not Modified.  Every QC10 product is engineered specifically for pistol caliber ammunition, not modified from an existing platform, increasing functionality, reliability and overall performance.