Description

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

These are 100% brand new, fully functional Toolcraft NiB BCGs with a minor cosmetic blemish. The blemish does not effect function or performance whatsoever, and the BCG is still covered by Toolcraft’s lifetime warranty. Blemishes vary by type and location but may be a blemish in the carrier itself or may be a minor cosmetic blemish in the finish. Some carriers may be marked with “Made in USA”.

All manufacturing and coating is done by Toolcraft

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



Bolt Assembly:

​Bolt: AISI 9310 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