UPDATE: Set now includes 4 shims: 2 thin and 2 thick shims!
Bison Armory AR-15 Barrel Nut Shim Set
4 Pack of 2x 0.001" thick shims and 2x 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: