AAC Shim Kit, 5.56mm 1/2-28, .750"OD x .500 ID. This AR shim set is produced by Advanced Armament Corp for the AR-15 and AR-10 rifle platforms chambered in 5.56x45mm and .223 Rem. This shim set assists in the timing and alignment of your muzzle device on barrels with a 1/2" x 28 TPI. This set includes a .030", .010", .012", .015", and .020" shims.

Includes:

.030" Black
.010" Yellow
.012" Green
.015" Red
.020" Blue

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