The Transmogrifier Gun is not a gun as such, but more of ... well, a box. Actually it's more like a trap for the unwary and gullible.
The principle is quite simple. When confronted with one's enemy, simple pull out the box, unfold it, put Tab A in Slot B, wind the spring, calibrate the scope and invite one's (gullible) enemy to crawl under for a quick peek. This sort of opportunity is far too great to resist for most (unwary) Heroes and monsters.
- Hey you there ! Just take a peek in here.
"Me ? Sure."
- Dial for transmogrification of your choice: Eel, Baboon, Bug or Dinosaur.
"Oh, Baboon sounds just fine."
- Say, how do you feel ? Better or worse ?
"Well, it itches a bit."
(With thanks and apologies to 'Calvin and Hobbes')