The popular Phantom Flash Suppressor has been redesigned to work as a muzzle brake and compensator. This 5 port design has no downward facing port which helps eliminate dust signature when shooting in the prone position. The 5M1 keeps the aggressive front end for use in hand to hand situations while the 5M2 features a smooth No Snag design. These products do not reduce the flash signature of the firearm.installation is available for all YHM products onto your rifle. - Specifications - Threaded 1/2-28 - Includes crush washer - Length: 2.25 - Weight: 3 Ounces.