Crush washers are made for one-time use to secure your flash hider or muzzle device.These are sized for most 30 cal bbls that are threaded for 5/8x21, may fit others our crush washers are machined from pre-ground stock and machined.
Use to align your muzzle devices without applying excessive torque to the barrel threads as is common with conventional crush washers. Provided torque is approximately 15 lb-ft. Do not reuse - remove and replace. Crush washers install with the angled side against the barrel and the flat side against the muzzle device.