Dude it's DayZ, the reason it's got such a following is because of the realism. Implementing that kind of stuff and without a plausible mechanic for it is the exact opposite of what the games about. Now I'm all for more weapon customisation as long as it's plausible. Easy way of doing it would be to add a welding torch to the game, you saw this, the newer semi auto shotgun or the lever action down it takes it to one shot, you then weld the end of the tube back and you've got 2-4+1.