Don't use an AR crush washer, you need to thread the mount on so that the back mates up directly to the shoulder behind the threads. Clean the rifle and mount threads, apply the Rocksett that came with the mount, and torque it down.
The flash hider itself is what gets the crush washer (that came with the mount), just put the washer on the flash hider threads, and tighten down till the flash hider is either bottomed out, or timed to your preference.
:thumbsu:
The flash hider itself is what gets the crush washer (that came with the mount), just put the washer on the flash hider threads, and tighten down till the flash hider is either bottomed out, or timed to your preference.
:thumbsu: