AIM AR/M16 BCG-X .223/5.56/.300BLACKOUT caliber 9310 MPI Nitride Bolt NiB Carrier Groups. Features a Black Nitrided, Shot peened, MPI (Magnetic Particle Inspected), 9310 Tool Steel Bolt; 8620 tool steel, enhanced radius cut, Nickel Boron coated M16 carrier; Properly staked, 4140 Machined, Black Nitrided Gas Key fastened with Hardened Grade 8 Fasteners. Extractor includes o-ring.
Carrier
- Nickel Boron Treated
- M16 style (Auto)
- Machined from 8620 tool steel
- Heat treated to military specifications
Bolt
- Black Nitrided
- Machined from 9310 tool steel
- Heat treated to military specifications
- Shot Peened
- Ground to meet military required tolerances
- MPI (Mag Particle Inspected)
Gas Key
- Black Nitrided
- Machined from 4140
- Heat treated to military specifications
Extractor
- Black Nitrided
- Machined from 4140
- Heat treated to military specifications
- Shot peened
Firing Pin
- Machined from 8640 tool steel
- Heat treated to military specifications
- Ground to meet military required tolerances
- Coated with .0002”-.0003” of hard chrome per MIL-STD-171 1.2.2.2
Cam Pin
- Black Nitrided
- Machined from 4340
- Quench and temper heat treat
- Ground to meet military required tolerances