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Brownells 75th Anniversary - A Shooting Heritage

Designed For Extra-Long Service Life

Complete bolt assembly is precision machined from an ultra-strong steel alloy to last up to 10 times longer than a standard carbon steel bolt, minimizing the risk of bolt failure during a critical engagement. SAE 9310 steel has a tough, ductile inner core highly resistant to stress fracturing, with a hard outer surface that resists galling and wear, to ensure a service life of up to 60,000 rounds. This is the same steel used in the transmission gears of Formula 1 race cars, so it’s ideal for high-impact, high-heat applications like sustained full-auto fire. Meticulously machined radiuses on all 90-degree corners on the locking lugs help distribute impact force evenly and further reduce risk of premature wear and cracking. Fully supported extractor face and precise extractor engagement further ensure smooth, reliable cycling.

Bolts are available individually, or in a completion group, which includes the bolt, firing pin, cam pin and firing pin retaining pin.  

Available caliber 223.

AR-15, Issue:11, Page:013
Big Book Catalog, Issue:73, Page:020
Big Book Catalog, Issue:73, Page:043
Sinclair, Issue:5B, Page:248

SPECS: SAE 9310 nickel-chromium-molybdenum steel, black nitrate. Fully assembled with extractor, gas rings, ejector, pins, and springs installed. .223 fits AR-15/M16 and clones. Fully compatible with any mil-spec bolt carrier.


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Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Black DLC

Hand: Right