CMMG 55AFF51 AR-15 Detent Spring & Pivot/Takedown Pin Set

The CMMG 55AFF51 detent spring and pivot/takedown pin set provides essential replacement components for AR-15 lower receiver assemblies. This precision-manufactured kit ensures proper function of the rifle's takedown mechanism, preventing costly downtime during maintenance or builds.

What Makes This Different

CMMG manufactures these components to mil-spec tolerances using hardened steel construction. The detent springs maintain consistent tension over thousands of cycles, while the pivot and takedown pins feature precise dimensional accuracy for smooth operation. Unlike generic aftermarket parts, these components undergo quality control testing to ensure reliable fit and function across all mil-spec lower receivers.

Key Features

• Hardened steel construction resists wear and deformation
• Mil-spec dimensions ensure compatibility with all standard AR-15 lowers
• Heat-treated detent springs maintain proper tension
• Precision-machined pins provide smooth takedown operation
• Complete replacement set includes all necessary components
• Corrosion-resistant finish withstands harsh conditions
• Drop-in installation requires no modification or fitting

These components handle the repeated stress of field stripping and reassembly without failure. The hardened steel construction maintains dimensional stability through temperature extremes and heavy use. Competition shooters and tactical professionals rely on these parts for consistent performance during high round-count training sessions and extended deployments.

Technical Specs

• Material: Heat-treated alloy steel
• Finish: Manganese phosphate coating
• Compatibility: All mil-spec AR-15 lower receivers
• Package includes: Detent springs, pivot pin, takedown pin
• Manufacturer: CMMG Inc.
• Country of origin: United States
• Weight: 0.5 oz complete set

This genuine CMMG replacement set eliminates guesswork when sourcing critical lower receiver components. The precise manufacturing tolerances and proven materials ensure long-term reliability in demanding applications.