ATI Shark Stainless Steel AR 15 Muzzle Brake w/Crush Washer - .223/5.56 NATO 1/2×28
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ATI Outdoors AR-15 Steel Shark Muzzle Brake, 5.56 NATO/.223 Remington - 708297, Rifle Barrels & Accessories at Sportsman's Guide
AR-15 .223/5.56 Steel Shark Muzzle Brake w/Crush washer
CERAKOTE COLOR OPTION AR-15/.223/5.56 Nato Steel Shark Muzzle Brake 1/2x28 Pitch Thread W/Crush Washer - OutdoorSportsUSA
TACFUN 1/2x28 Thread Steel Crush Washer (Pack of 10) for .223: : Industrial & Scientific
ATI AR-15 Shark Muzzle Brake w/Crush Washer - .223/5.56 NATO 1/2×28