Check the listing for details. Advanced Dead Air KeyMo Style QD Muzzle Brake - .308 Cal 5/8 -24 in. Color: Black, Condition: New. Listed at 65.99 USD. Experience enhanced performance with our improved muzzle brake, featuring a quick-detach interface compatible with KeyMo / Dead Air style suppressors. Its two strategically positioned vertical vent ports provide superior muzzle control when shooting without a suppressor. Engineered with a finely tuned, balanced internal baffle design, this brake ensures exceptional blast control. Crafted from hardened alloy steel and finished with a durable black oxide coating, it’s built to last.This muzzle brake is for all hunting rifles with .308 caliber / 7.62mm barrels and 5/8 in -24 in thread.Package includes: (1) muzzle brake, (1) packet of shims and installation instructions.Advanced Dead Air KeyMo Style QD Muzzle Brake - .308 Cal 5/8 -24 in. Installation instructionsJust like the muzzle brake that came with your device,DO NOT USE A CRUSH WASHER with the installation of this muzzle brake. This muzzle brake has been supplied with 5 shims so you can properly time the muzzle brake for proper orientation. Included are three thicker shims and two thinner shims to fine tune the timing of the muzzle brake. The two relief ports are to be located on the top at the 12 o’clock position. It is strongly recommended to use a high strength or permanent thread locker such as the Red Loctite 262 (high temperature), Rocksett or equivalent (not included) on the threads of your barrel just before installing for a secure hold.