CMMG 38AFF31 HD Pivot Takedown Pin Kit 308 Win MK3 Metal

The CMMG 38AFF31 Parts Kit delivers heavy-duty pivot and takedown pins engineered specifically for 308 Winchester MK3 platform rifles. These reinforced metal pins address the increased stress loads generated by larger caliber cartridges, providing enhanced durability over standard AR-15 components.

What Makes This Different

Unlike standard pivot and takedown pins designed for 5.56/.223 platforms, these HD pins feature increased material thickness and upgraded steel construction. The enhanced design handles the additional recoil forces and cycling stress inherent in 308 Winchester chamberings. CMMG rates these pins for extended service life in high-round-count applications where standard pins typically fail.

Key Features

• Heavy-duty steel construction rated for 308 Winchester recoil forces
• MK3 platform specific geometry ensures proper fit and function
• Increased wall thickness compared to standard AR-15 pins
• Precision machined tolerances maintain tight upper/lower receiver fit
• Corrosion-resistant finish protects against environmental exposure
• Drop-in replacement for factory MK3 pivot and takedown pins
• Compatible with CMMG MK3 receivers and similar 308 AR platforms

Field testing demonstrates these pins maintain structural integrity through extended firing sessions where standard components show wear. The reinforced design proves particularly valuable for competitive shooters, law enforcement applications, and hunting scenarios requiring rapid follow-up shots. Weather-resistant coating ensures reliable operation in adverse environmental conditions.

Technical Specs

• Caliber Compatibility: 308 Winchester/7.62x51 NATO
• Platform: CMMG MK3 and compatible large-frame AR rifles
• Material: Heat-treated steel construction
• Finish: Corrosion-resistant coating
• Package Contents: Pivot pin and takedown pin
• Manufacturer: CMMG Inc.
• Country of Origin: United States

This parts kit represents a cost-effective upgrade that prevents field failures during critical moments. Professional armorers and serious shooters recognize the value of reinforced components in high-stress applications.