Guns are for killing. Nothing else. Unlike cars, trains, planes, knives, axes and lawnmowers.
Guns are also for hammering, breaking things apart, marking lines and points in a straight line, measuring distances, drilling holes, removing nails and screws, sanding off sharp corners, adding rough wood texture, filing edges, and holding work pieces in place. They are a very diverse and excellent carpentry tool. I believe even Jesus used one.
You actually could use a gun foe some those things. Not very efficient, but usable.