Let's see then...
- All the R.Y.N.O. incarnations
- SHOTGUNS
- Holy Mackerel from TF2
- Aperture Science Handheld Portal Device. Even better, Potato gun >:3
- Gunblade from Final Fantasy 8
- That big gun from that cool game

- Compressed Air High Speed Pellet Dispenser, or CAHSPD for short from my game Paco the Manay
And many many more >:3