Jumped into the pool with this WE Hi-Capa 5.2 "Striker" gas blowback pistol and fired through an entire CO2 magazine in this video. Both above and underwater shooting, HD footage as well as up to 1000 frames per second high speed clips. The bubbles coming off of the gun look great in slow motion.
Disclaimer: Don't try this on a gun unless you're prepared for it to break. Just because this particular pistol survived this particular video doesn't mean that it won't wreck yours. I take no blame for anyone who tries this themselves.
Filmed, edited, and uploaded this while on vacation, on a laptop, so I really hope you guys like it!