Shop › ADV TECH AR15 223/5.56 MZL BRK STL ADV TECH AR15 223/5.56 MZL BRK STL $35.99 ATI Outdoors Shark Muzzle Brake, 1/2-28 Thread With Crush Washer, Fits AR-15, Black Oxide Finish A.5.10.2251 Quantity: Add To Cart Added! ATI Outdoors Shark Muzzle Brake, 1/2-28 Thread With Crush Washer, Fits AR-15, Black Oxide Finish A.5.10.2251