Bison Armory AR-15 Barrel Nut Shim Set
3 Pack of 0.001" thick shims 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: