This ported 5.5" muzzle brake/flash hider is perfect if you want to add some length to a short barreled rifle project or are looking for a different look for your AR. It is a machined, ported muzzle brake finished in black oxide. It is threaded 1/2x28 for standard AR-15 threads. It can be pinned and welded for compliance as well. works with .223. 5.56 & 9mm. Weighs about 7 ounces.