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Set of 3 shims for the M14/M1A gas system. Consists of .005, .010 and .020 stainless steel precision shims. By using these in combination, you can cover a complete rotation of the gas cylinder lock in .005 (about 1/6 turn) increments. USGI gas cylinder/cylinder lock/front band combos usually shim tight at .020-.025. These mount between the barrel shoulder and the front band. 300 Series Stainless Steel.
