Toolcraft BCG Nickel Boron AR15 / M16 Auto Bolt Carrier Group 9310 MPI Tested

All manufacturing and coating is done by Toolcraft.

100% Made in USA and includes Lifetime Warranty from Toolcraft. If ever a problem, simply call Toolcraft and they will take excellent care of you with their no questions asked Lifetime Warranty.

Bolt Assembly:

â€‹Bolt: Carpenter 158 alloy steel

MPI Inspected

Extractor: Shot Peened Hardened D2 tool steel

O-Ring: Mil-Spec

Gas rings (3): Mil-Spec

Finish: Nickel Boron

Bolt Carrier:

8620 steel

Heavy Duty M16 design

Grade 8 Gas Key Screws, Staked

Gas Key Material: 4140

Finish: Nickel Boron

Cam Pin:

8620 steel

Finish: Nickel Boron

Firing Pin:

mil-spec firing pin made from centerless ground 8740 steel, hard chrome coated