Alex,
The gun you showed us, and the one I took a photo of, have different shaped underside .... below the long "nozzle???" is a shorter one, mine looks ROUNDED and yours looks VEE-d.
Question, the long thing with the hole in it that the bullet thingy's shoot through, is that referred to as a "nozzle"? I also forget what the "bullets" are called

Am a lousy student here
Karmen