Carrier made with 8620 Steel and bolt made from 9310 Vac-Arc Premium Carburizing Steel which has a high core hardness and high fatigue strength unlike standard Hot/cold rolled 9310 steels. The nitride coating is the strongest plate available, it's the same protective finish that's used in gun barrels and CNC tool protection. If you're looking for a bolt carrier that's going to hold up against the roughest conditions, then this bolt carrier group is the one for you.

• AR15 and M16 Compatible
• 8620 Steel Carrier Nitride Coated
• 9310 Vac-Arc Steel Bolt Nitride Coated
• 4340 Steel Cam Pin Nitride Coated
• 4140 Steel Gas Key Nitride Coated
• Tool Steel Extractor Nitride Coated
• Shot Peened
• MPI (Magnetic Particle Inspected)
• HPT (High Pressure Tested)
• Gas key staked to Mil-Spec Standards
• Grade 8 Hardened Fasteners
• Extractor Insert with upgraded Crane O-Ring
• Power Spring Kit
• Bolt engraved with MPI/9310