The Griffin Armament 2-Port Muzzle Brake is a compact muzzle device that is compatible with all Griffin Armament taper mount silencers and accessories. Geometrically designed to keep weight to a minimum, the 2-Port Muzzle Brake offers full size performance without the weight penalty. Equipped with two rearward directing recoil reducing ports, with vertical compensation slots, the two port brake provides flat shooting performance in addition to maximum braking power. Machined from high strength, corrosion and water resistant 17-4 stainless steel, and a Melonite QPQ finish provides a durable, attractive muzzle brake. Includes a shim set.