The CMMG firing pin retainer is the steel pin that holds the firing pin in the bolt carrier of an AR-15 or M16. It is a common part to lose during cleaning, and a worn or bent retainer should be replaced. CMMG has built AR-15 and AR-10 rifles and parts since 2002.
- Part: Firing pin retaining pin
- Fits: AR-15 / M16 bolt carriers
- Material: Steel
- Color: Silver
- Manufacturer part #: 55BA4C5
