American Built Arms Company AR-15 Firing Pin 5.56mm Chrome Mil-Spec

The American Built Arms Company AR-15 Firing Pin is a Mil-Spec replacement firing pin machined from 8740 steel and finished in a corrosion-resistant chrome plating. Built as a direct-fit, mil-spec replacement for worn, damaged, or lost factory pins, this component drops into standard AR-15 bolt carrier groups without any modification, restoring reliable primer strike on duty, competition, and recreational rifles alike.

Versatility is a key feature of this pin: while designed around the 5.56 NATO chambering, the same AR-15 bolt carrier geometry also supports .223 Remington and .300 AAC Blackout builds, so this single firing pin covers the three most common AR-15 cartridges. Whether you are performing routine field maintenance on a duty rifle, finishing out a custom build, or stocking spares for an armorer's kit, this pin delivers the consistent ignition strike needed for dependable primer detonation.

Manufactured by American Built Arms Company to AR-15 Mil-Spec dimensions, the firing pin is dimensioned at 1.55 x 2.70 x 3.60 inches and weighs just 0.05 lbs. The chrome plating holds up to field use, repeated cleaning with standard solvents, and long-term storage without pitting or corrosion. Sold as a single small part, it is a smart, low-cost insurance item for any AR-15 armorer, builder, or range-goer who wants a quality factory-style firing pin on hand.