This complete bolt-and-carrier group easily drops into a standard mil-spec AR-15 upper, and it's ready to shoot. Batch magnetic particle inspected bolt gives long service life. Bolt and carrier feature a matte black phosphate finish that resists heat, wear and corrosion. Carrier is chrome lined and has a staked gas key. Includes bolt assembly, firing pin, firing pin retaining pin, cam pin and complete carrier. The bolt assembly contains the correct black insert and tool steel extractor. The bolt is MPI (Magnetic Particle Inspected) and HPT (High Pressure Tested) material batch tested, to ensure high quality and longevity. Bolt and carrier feature a matte black phosphate finish that resists heat, wear and corrosion. Carrier is chrome lined and has a staked gas key attached. 

Features and Specifications:

• Manufacturer Number: AR-100
• Caliber: 5.56 NATO
• Made from Carpenter 158 steel
• Batch MPI and HPT tested bolt
• Matte black phosphate finish bolt and carrier
• Chrome lined Carrier with staked gas key attached

Includes:

• Bolt assembly
• Firing pin
• Retaining pin
• Cam pin
• Complete carrier