AIM .308/7.62x51 Caliber Nickel Boron Bolt Carrier Group. The Bolt is shot peened and manufactured out of 9310 Tool Steel with a 4140 Machined Extractor. The Carrier is the more common DPMS pattern with a Nickel Boron finish for easier cleaning and provides a slicker surface. The Gas Key is Hardened to USGI Specifications and fastened to the carrier using Grade 8 Hardware, and then properly staked. More information below.
Carrier
- Machined from 8620 tool steel
- Heat treated to military specifications
Bolt
- Machined from 9310 tool steel
- Heat treated to military specifications
- Shot Peened
- Ground to meet military required tolerances
- MPI (Mag Particle Inspected)
Gas Key
- Machined from 4140
- Heat treated to military specifications
Extractor
- 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
- Machined from 4340
- Heat treated to military specifications
- Ground to meet military required tolerances