AR15 Firing Pin AR 15 Firing Pins. Titanium firing pin. A stainless steel firing pin for all AR-15 rifles. Replacement Firing Pin for AR 15 Rifles. Quality-made, original-style, chrome pin. Perfect for replacement of worn or damaged pins; great for building new rifles. Small collar fits all carriers. Precision-machined Titanium firing pin is nearly 40% lighter than a standard steel pin for faster lock time. Minimizes risk of accuracy being compromised by weapon movement before the pin hits the primer. Corrosion- and high-temperature resistant to eliminate galling, fretting, and seizing. Our AR15 firing pin is made with 100% Grade 6 hardened Titanium.