CMMG M16/AR Firing Pin Retainer – AR-15/M16 Bolt Carrier Groups

The CMMG firing pin retainer is a small but critical component that secures the firing pin inside AR-15 and M16 bolt carrier groups. This retainer prevents the firing pin from walking out during cycling, ensuring reliable ignition and safe function. If your original retainer is damaged, worn, or lost during cleaning or maintenance, this genuine CMMG replacement restores your BCG to proper working order.

Machined to mil-spec dimensions, this retainer is constructed from hardened steel for durability under repeated firing cycles. Installation is straightforward for anyone familiar with AR-15 disassembly—simply insert the firing pin, align the retainer, and tap it into place with a punch. No gunsmithing required. A spare retainer is a practical addition to any AR builder's or armorer's parts kit.

• Part Type: Firing Pin Retainer
• Compatible Firearms: AR-15, M16, AR-10 (depending on BCG)
• Material: Hardened Steel
• Finish: Phosphate
• Installation: Drop-In (basic tools required)
• Includes: (1) Firing Pin Retainer