This muzzle brake was on a custom 7 STW made by Guillard. I didn't need a hearing protector due to the way how those vent channels were drilled as indicated by the hex wrench. This way gases and sound was reflected away from the shooter. This was the best of all brakes that I've used.
Now I have Sako S20 factory brake and the first 2 raws close to the shooter are drilled the same way. I will use it this year when developing a load for my S20 in 300Win Mag so I am hoping that will be as good as the one in the picture.
