AR-15 Bolt Carrier Group - Nitride
Individually 9310 MPI tested Bolt
Carrier: 8620 Tool Steel-(M16 full shroud)-Heat Treated, Case Hardened
Gas Key: Tool Steel-Attached using Grade 8 Hardened Fasteners, & Staked.
Cam Pin: 4140 Steel
Extractor:Tool steel-shot peened
Features a shot-peened bolt for increased surface strength and durability, and an extractor booster to ensure reliable cycling during rapid semi-auto or full-auto fire. Includes Colt M16 firing pin upgrade. Each assembly is magnetic particle inspection tested to ensure it’s free from imperfections that can lead to premature failures. Properly staked gas key prevents gas leakage that can lead to short stroking. Staked screws, Melonite coating