The AR-10 LR-308 muzzle brake/flash hider with crush washer for sale is Krinkov style 5/8-24 thread muzzle brake for use with .30 cal .308/6.8/300 blackout AR-10 and AK-47 rifles. This style muzzle brake is a three piece design to directs the muzzle blast forward and reduces recoil and flash designed to increase reliability in short barreled rifles and pistols. Precision CNC machined high quality heat treated steel with Military style black oxide finish. Length: 3.69 inches. Steel crush washer included. One year limited warranty.