Boy, It's been a long while since I've put a few yards thru a M60!!! Thanks for that brother, ain't heard that in years!!!Savage Super Striker 15" barrel, 308 Winchester, had an on -off muzzle brake that was open or closed with a twist. Earmuffs off, a nearly deaf guy could tolerate firing with brake closed. When that brake's open, like putN a couple yards thru an M60, same bad ring for few days following!