AR 5/8x24" Crush Washer
Crush Washer used for mounting muzzle devices and fits barrels with a 5/8x24 thread. Crush washers crush down to allow end user to install muzzle device and crush down to allow for precise alignment. For proper installation make sure narrow side is against barrel shoulder and wider side against muzzle device.
NOT TO BE USED FOR SILENCER INSTALLATION!