The Fail Zero EXO Basic Semi Kit (brand part number FZ-AR15-01-SAH) is a fully assembled AR15 bolt carrier group that includes the hammer, ready to drop into most mil-spec AR15 upper receivers. Fail Zero coats every critical part in EXO Nickel Boron, which provides a permanently lubricious surface along with a real increase in wear resistance and corrosion resistance over an uncoated carrier group. Because the kit includes the hammer, it is a complete solution for builders assembling a semi-auto lower who do not already have one on hand. The coating also means less time scrubbing carbon after a range session.

Key Specifications

• Includes hammer for a more complete drop-in solution.
• Fits most mil-spec AR15 upper receivers for broad compatibility.
• Fully assembled bolt carrier group ready to install.
• EXO Nickel Boron coating on all critical components.
• Increased wear and corrosion resistance compared to an uncoated BCG.

Frequently Asked Questions

Does this kit include the hammer? Yes, the Basic Semi Kit includes a hammer along with the fully assembled bolt carrier group.

What upper receivers does it fit? Most mil-spec AR15 upper receivers.

Buy the Fail Zero EXO Basic Semi Kit

Get a complete, coated bolt carrier group and hammer in one drop-in kit. Order it from our Lubbock, Texas gun shop as soon as it’s available to ship, and browse more AR bolt carrier groups for your build.