This AR-15 style 5.5" vented 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 AK. It is a machined, muzzle brake with locking notches to prevent any movement while under fire. It is threaded 14 x1 LH for the AK-47, also fits Century Arms C39 AK. It can be pinned and welded for compliance as well. Weighs about 7 ounces.