I made this thing for a forum game idea I've been working on (Basically sci-fi zombie survival).
Sorry about the extremely small size.
I'll be working on a matching rifle of the same type, though it'll be a touch more difficult. Once it's done, though, I'll post it here.
Does it shoot acid? That shade of green looks dangerous.
Close. It fires a compound called Zalite, which is very corrosive to organic materials, but tends to do little versus inorganic materials. The pistol holds enough Zalite for 4 shots, and it works by siphoning a fourth of the bottom reservoir when it's cocked, and placing it into the top reservoir and barrel. The magazines are highly compressed, allowing it to do this rather quickly. Once the Zalite is in the top reservoir and barrel, it gets compressed again by it snapping back into place and pressing it against a valve at the front. Pulling the trigger releases it at high speeds, effectively making a high impact corrosive bullet. In addition, the top reservoir can be further pressurized by slowly pulling the gun back (Too fast and a valve releases the pressure back into the magazine, also allowing the same motion to cock the gun) and hitting a lock on the back of the gun. This causes the burst to be more accurate, since it doesn't have as much of an arc.
The exposed "windows" aren't just for looks, by the way; Zalite, when compressed, heats up very quickly, meaning that in order to stop the gun from melting, several parts of the tubing remain exposed to allow the heat to escape, though detonations still aren't entirely unheard of.
And yes, I am overthinking this game.