The Dead Air Shim Kit is composed of three different shim thicknesses for the most precise timing of your muzzle device. The graphic on the packaging details the thicknesses and identifying features of the shims included with the kit. Always place the thickest shim on the barrel shoulder first.
1/2-28 One notch - Qty 4, .004" thick, ~40 degree rotation, ~1/9 turn Two notches - Qty 5, .006" thick, ~60 degree rotation, ~1/6 turn No notch - Qty 1, .060" thick, ~1.7 turn5/8-24One notch - Qty 4, .004" thick, ~35 degree rotation, ~1/10 turn Two notches - Qty 5, .006" thick, ~50 degree rotation, ~1/7 turn No notches - Qty 1, .060" thick, ~1.4 turn
