Mac has 2 types of air hammers, the long barrel 1911 and the short barrel 1931. Both of them are very destructive, The long one hits a little harder and is physically bigger, the shorty is better in tight quarters and is much faster hitting. both are industrial grade, not your harbor freight garbage. Very rarely have I had to send either in for repair. Note: the quick dis connect is lifetime, should the rubber insert ever get damaged. Last time I checked, they were @ 400. I am going to include a spare set screw that goes on the bottom side of the barrel, they fall out once in a while from extreme use. I'm also throwing in a secret drive bit because I'm a cool dude..
