I made some flight cases for the US Military, sents us two 'training guns' that took rubber bullets so would could make cut outs in the foam foam for them to fit, was handy that we had rubber bullets at the factory, shot an M4 and a Desert Eagle. Not the same as a real gun, but still fun.
On the other hand, I used a shot gun a few times when I was clay pigeon shooting and my dad a an air rifle that was used to shoot in the garden