The Yankee Hill Machine 285M1 has undergone a redesign, evolving its widely favored Phantom Flash Suppressor into a functional muzzle brake and compensator. Featuring a 5 port design, it offers the unique advantage of having no downward facing port, thereby reducing dust signature when fired from the prone position. Retaining the aggressive front end design of the 5M1, this is a useful addition in close-combat scenarios. Please note that these products do not decrease the flash signature of the firearm.We provide an installation service for all Yankee Hill Machine products on your rifle. There may be some restrictions, so we encourage you to contact us for more details. The product comes threaded at 1/2\"-28 and includes a crush washer. It has a length of 2.25\" and a weight of 3 ounces.