NBS Nickel Boron Bolt Carrier Group for .223/5.56/300BLK
Carrier
- M16 style (Auto)
- Machined from 8620 tool steel
- Heat treated to mil spec
Bolt
- Machined from 9310 tool steel
- Heat treated to military specifications
- Shot Peened
- MPI (Mag Particle Inspected)
Gas Key
- Machined from 17-4 Stainless Steel
- Heat treated to mil spec
Extractor
- Machined from S-7 shock resisting tool steel
- Heat treated to mil spec
- Shot peened
- Extractor spring is made of stainless steel music wire
Firing Pin
- Machined from 17-4 stainless steel
- Heat treated to milspec
Specifications
- Weight:Â 11.6 oz
- Length: 7.5″
- Finish: Â Nickel Boron (NiB)
- USA Made
- Covered by NBS Limited Lifetime Warranty