This Firing Pin for AR-15 is a direct-fit M4-style firing pin from Sons of Liberty Gun Works (brand part no. M4FIRINGPIN), built for standard AR-15 bolt carrier groups. The firing pin rides inside the bolt and strikes the primer when driven forward by the hammer, so a worn, chipped, or broken pin is a common cause of light strikes or failures to fire. This is a straightforward drop-in replacement for a standard bolt carrier group.

Key Specifications

• Functions as the firing pin that strikes the primer when driven forward by the hammer.
• Built to M4-style dimensions for standard AR-15 bolt carrier groups.

Frequently Asked Questions

What does the firing pin do? It rides inside the bolt and strikes the primer when driven forward by the hammer, firing the round.

Will this fit a standard AR-15 bolt carrier group? Yes, it’s built to M4-style dimensions for standard AR-15 bolt carrier groups.

Buy the Firing Pin for AR-15

Replace a worn or chipped firing pin with this Sons of Liberty Gun Works part built for standard AR-15 bolt carrier groups. It ships fast from our Lubbock, Texas gun shop, and our small AR-15 parts selection has more small AR-15 parts.