- Assembled Bolt Carrier Group for AR-15/M16
- Bolt made of Carpenter No. 158 steel
- Shot peened bolt
- Bolt carrier made of 8620 steel
- Magnetic Particle Inspected and marked "MPI"
- Hard chrome lined carrier with phosphate finish
- Chrome lined gas key, properly staked
- Black extractor insert
- Shrouded firing pin
- Mil-spec O-ring
The MIDWEST INDUSTRIES Bolt Carrier Group (MI-BCG) is an assembled bolt carrier group for AR-15/M16. It is made of 8620 steel, while the bolt itself is made of Carpenter No 158 Steel. The group is Magnetic Particle inspected to ensure quality operation both today and in the future.