Shop › SEEKINS AR ATC COMP 1/2X28 BLK SEEKINS AR ATC COMP 1/2X28 BLK $99.00 Seekins Precision AR ATC Muzzle Brake, 223 Rem/556NATO, Melonited Black Finish, 1/2X28 Threads 11510035 Quantity: Add To Cart Added! Seekins Precision AR ATC Muzzle Brake, 223 Rem/556NATO, Melonited Black Finish, 1/2X28 Threads 11510035