NBS .223/5.56/300 BLK Complete Bolt Carrier Group – Nickel Boron

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: 11.6 oz

Length: 7.5″

Finish: Nickel Boron (NiB)

USA Made

Covered by NBS Limited Lifetime Warranty