Designed for both the M16 and the AR‑15 platform, the CMMG Firing Pin Retainer (55BA4C5) delivers the perfect blend of durability and precision. Crafted from high‑strength silver‑toned alloy, this retainer ensures a secure hold on the firing pin, reducing the risk of malfunctions and extending the lifespan of your firearm’s trigger assembly.

Key Benefits

• Enhanced Reliability: Securely locks the firing pin in place, preventing inadvertent movement during cycling.
• Easy Installation: Fits standard M16/AR‑15 receivers without the need for additional tools or modifications.
• Corrosion‑Resistant Finish: The silver coating provides protection against moisture and harsh environmental conditions.
• Lightweight Design: Optimized for minimal added weight while maintaining structural integrity.
• OEM‑Level Compatibility: Engineered to meet or exceed original equipment specifications for flawless integration.

Technical Specifications

Why Choose CMMG?

CMMG has been a trusted name in the firearms industry for over three decades, delivering high‑quality components that are rigorously tested for performance and safety. The CMMG Firing Pin Retainer is no exception—engineered to meet the demanding needs of professional shooters, law‑enforcement personnel, and dedicated hobbyists alike.

Installation Overview

1. Ensure the firearm is unloaded and the bolt is fully closed.
2. Locate the existing firing pin retainer cavity inside the receiver.
3. Insert the CMMG retainer, aligning the notch with the firing pin groove.
4. Gently press until the retainer snaps securely into place.
5. Perform a function check to confirm smooth operation.

For best results, refer to your rifle’s owner manual or consult a qualified gunsmith.

Customer Reviews

"The CMMG retainer felt solid from the moment I installed it. No more worries about a loose firing pin during extended range sessions." – James D., Competitive Shooter

"Great fit and finish. The silver coating matches the look of my upgraded lower perfectly." – Linda K., AR‑15 Enthusiast

Related Accessories

• CMMG Trigger Group Kit – Upgrade your trigger pull for a smoother shooting experience.
• CMMG Bolt Carrier Group – Pair with the retainer for a complete reliability package.
• CMMG Upper Receiver – Optimize performance with a precision‑machined upper.