This 3.5" AR-10 A1 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, ported muzzle brake with locking notches to prevent any movement while under fire. It is threaded 5/8x24 for the AR-10. It can be pinned and welded for compliance as well. Weighs about 5 ounces.