Shop › GEMTECH QUICKMOUNT MB 5.56 1/2-28 GEMTECH QUICKMOUNT MB 5.56 1/2-28 $94.05 Gemtech QUICKMOUNT, Carbon Cutting Muzzle Brake, 5.56NATO, 1/2X28, Black Finish 12152 Quantity: Add To Cart Added! Gemtech QUICKMOUNT, Carbon Cutting Muzzle Brake, 5.56NATO, 1/2X28, Black Finish 12152