KNS Precision Firing Pin Retaining Pin, AR-15/M16, Black

The KNS Precision Firing Pin Retaining Pin (part no. PERMA) replaces the standard cotter pin found in an AR-15/M16 bolt carrier, the small part that retains the firing pin as it was in the original Stoner-designed rifles. KNS Precision machines it from steel as a permanent, more durable alternative to the bend-and-reuse factory cotter pin, so you’re not fighting a fatigued pin every time you clean the bolt carrier group. It’s built for standard AR-15 BCGs and does not fit .308 bolt carriers.

Key Specifications

• Replaces the standard cotter pin in the bolt carrier group.
• Retains the firing pin, matching the original Stoner rifle design.
• Machined from steel as a permanent, more durable alternative to the factory pin.
• Fits standard AR-15/M16 bolt carrier groups.
• Does not fit .308 bolt carriers.

Frequently Asked Questions

What does this pin replace? The standard cotter pin that retains the firing pin in an AR-15/M16 bolt carrier.

Does this fit .308 bolt carriers? No, it’s sized for standard AR-15/M16 BCGs only.

Why choose this over the factory cotter pin? It’s a permanent steel design that doesn’t fatigue the way a bent cotter pin does with repeated cleaning.

Buy the KNS Precision Firing Pin Retaining Pin

A fatigued cotter pin is an easy thing to overlook until it fails at the range, and this permanent steel pin removes that risk for good. Order it from our Lubbock, Texas gun shop for fast shipping, along with more small AR-15 parts.