AR-15 7.62x39 Bolt Assembly | Complete Bolt

AR-15 7.62x39 Bolt Assembly – Carpenter 158 | MPI Tested

The AR-15 7.62x39 Bolt Assembly is engineered for durability and consistent performance in 7.62x39 AR platform builds. Manufactured from premium Carpenter 158 steel, this bolt meets true mil-spec material standards for strength and longevity.

Each bolt is fully mil-spec heat treated to ensure proper hardness and structural integrity under repeated firing cycles. Following heat treatment, the bolt undergoes Magnetic Particle Inspection (MPI) to detect potential material flaws and ensure reliability.

The bolt assembly includes a properly configured extractor system with spring, insert, and Crane O-ring installed to enhance extraction performance and improve reliability — especially in higher pressure or steel-cased ammunition applications.

Finished in a durable magnesium phosphate coating, the bolt resists corrosion while maintaining proper lubrication retention for smooth operation.

Specifications

• Material: Carpenter 158 Steel
• Heat Treatment: Full Mil-Spec
• Inspection: Magnetic Particle Inspected (MPI)
• Extractor Setup: Spring, Insert & Crane O-Ring Installed
• Finish: Magnesium Phosphate
• Caliber: 7.62x39
• Platform: AR-15

Built for Reliable 7.62x39 Performance

Whether you're completing a 7.62x39 AR-15 build or replacing a worn bolt, this assembly provides the strength, inspection standards, and extraction support required for dependable performance.