Shop › FORTIS MUZZLE BRAKE 556 SS FORTIS MUZZLE BRAKE 556 SS $66.45 Fortis Manufacturing, Inc. Muzzle Brake, 5.56MM, Stainless Finish, Fortis Control Compatible 556-MB-SS Quantity: Add To Cart Added! Fortis Manufacturing, Inc. Muzzle Brake, 5.56MM, Stainless Finish, Fortis Control Compatible 556-MB-SS