The quality of these brakes is on a par with the brakes we carry from our Canadian-made suppliers and this popular design looks and works great!
Model: CMC5-AS-369MB
We recommend a screwdriver with a few wraps of duct tape around the shaft - insert through the 'gills' of the brake and then twist on to crush the washer and keep it all straight and tight. Just ensure that you don't turn too far - if you back off you will need a new crush washer! See pic for correct install orientation.
Please Note: Pics show the 5.56 version - this brake is the same but with a larger bore to accommodate 9mm rounds.