The Armaspec AR9 Firing Pin (brand part no. ARM682-SS) is a precision-machined replacement firing pin sized for 9mm AR-platform bolt carrier groups. Armaspec machines the pin from 17-4 stainless steel and heat-treats it to the H900 condition, giving it the hardness needed to withstand repeated blowback-cycle strikes. Pistol-caliber AR builds run their bolts faster and harder than a gas-impingement 5.56 gun, which accelerates wear on a soft factory firing pin over time. This hardened stainless pin is a direct-fit replacement for a standard AR9 bolt carrier group, no fitting or gunsmithing required.

Key Specifications

• Machined from 17-4 stainless steel for corrosion resistance and long-term strength under repeated impact.
• Heat-treated to the H900 condition for a hard strike face that resists peening from blowback-cycle firing rates.
• Built as a direct-fit replacement for standard AR9 bolt carrier groups, requiring no modification.

Frequently Asked Questions

What platform is the Armaspec AR9 Firing Pin built for? It is sized specifically for 9mm AR-platform (AR9) bolt carrier groups, not standard 5.56 AR-15 carriers.

What makes this firing pin more durable than a factory pin? The 17-4 stainless steel body and H900 heat treatment give it a harder, more wear-resistant strike face for the higher cyclic loads of a blowback 9mm build.

Buy the Armaspec AR9 Firing Pin

A hardened stainless firing pin is cheap insurance against light strikes on a hard-running 9mm AR build. Check out Schaefer Defense’s small AR-15 parts lineup and order from our Lubbock, Texas gun shop for fast, reliable shipping.