M16 NiB Complete Bolt Carrier Group
This is an Allstar Tactical M16 Complete Bolt Carrier Group with Nickel Boron (NiB) Coating. This drop-in replacement for your AR15 will increase reliability, and ease cleaning / maintenance. These are completely Mil-Spec components, with the only exception being the NiB Coating. Nickel Boron has all of the positive attributes of Hard Chrome, with none of the negative ones; it improves wear resistance, and reduces friction without flaking. These BCG's are made proudly in the USA for us and are laser engraved with the Allstar Tactical logo.
- Bolt is Carpenter 158 Steel case hardened, shot peened, and MPI/HPT tested. Manufactured to Gov't drawings. Mil-Spec Gas Rings
- Tool steel extractor, black insert, and tension-enhancing o-ring.
- Mil-Spec full-auto M16 carrier made from 8620 steel, heat treated, case hardened and is chrome-lined.
- Firing pin is heat-treated, case-hardened and hard chromed.
- Gas Key is hardened, chrome-lined, attached with Grade 8 fasteners and staked per Military specifications.
- Assembled complete
Advantages of Nickel Boron Coating
- Unique combination of wear resistance and low coefficient of friction
- Superior to Hard Chrome
- Reduces coefficient of friction
- Exceeds Rockwell 70c in hardness