The Q Cherry Bomb Muzzle Brake for 7.62MM rifles, threaded 5/8 24, is a Quickie Fast-Attach designed to work seamlessly with Q's THUNDER CHICKEN and trash PANDA silencers. It's built with a taper mount shoulder that lines up perfectly with Q barrels and silencers, making installation a breeze with a 1/2 inch socket on the front. No need for timing and shims thanks to its 360 ports. This stainless steel beauty adds just 0.8 inches to your barrel length and weighs only 2.0 oz. WEIGHT: 2.0 oz. OVERALL LENGTH: 1.64 MA MATERIAL: 17-4 Stainless Steel LENGTH ADDED TO BARREL: 0.8 7.62mm