The Fail Zero 6mm ARC Bolt Carrier Group (Fail Zero part no. FZ-6mm-ARC-NH) comes fully assembled and ready to drop into most mil-spec upper receivers chambered in 6mm ARC. Fail Zero coats every critical part with EXO Nickel Boron, which gives the group permanent dry lubricity and extra resistance to wear and corrosion. The coating also makes cleanup easy, and it helps keep the rifle running. It is a straightforward upgrade for a 6mm ARC build.

Key Specifications

• The chambering is 6mm ARC, so the bolt is cut for that cartridge.
• The group arrives fully assembled and ready to install.
• All critical parts are coated in EXO Nickel Boron, which provides permanent dry lubricity and resists wear and corrosion.
• The carrier is an M16 cut bolt carrier, the standard profile for mil-spec uppers.
• The nickel boron treated parts are the 6mm ARC bolt and extractor, carrier, cam pin, carrier key and firing pin.
• It is built to drop into most mil-spec upper receivers chambered in 6mm ARC.

Frequently Asked Questions

Does this bolt carrier group come assembled? Yes. Fail Zero ships it fully assembled, and it is ready to drop into most mil-spec upper receivers chambered in 6mm ARC.

What does the EXO Nickel Boron coating do? It provides permanent dry lubricity, increases wear and corrosion resistance and makes cleanup easy, according to Fail Zero.

Which parts are coated? The 6mm ARC bolt and extractor, the M16 cut bolt carrier, the cam pin, the carrier key and the firing pin are all nickel boron treated.

Buy the Fail Zero 6mm ARC Assembled Bolt Carrier Group, Nickel Boron

The bolt carrier group is the heart of any AR, and a coated, assembled one removes a few variables from a new 6mm ARC build. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see more AR bolt carrier groups for the rest of the upper.