100% MADE IN USA - JUST LIKE ALL BISON ARMORY PRODUCTS!

UPDATE: Set now includes 8 shims: 4 thin and 4 thick shims!

Bison Armory AR-15 Barrel Nut Shim Set

8 Pack of 4x 0.001" thick shims and 4x 0.002" thick shims. That's enough to complete at least 2 upper assemblies with standard barrel nuts (Aero take more). These shims are for use in the installation of ALL AR-15 rifle barrels, including 223, 5.56, 6.8 and 300 BLK.

Achieve perfect barrel nut / gas tube allignment within the correct barrel nut torque specifications every time, guaranteed!

NOTE: Use of these shims will NOT affect bolt / barrel headspace.

Instructions are included with your order, and please watch our instructional video on You Tube below: