While not a gun in the truest sense of the word, the Portal gun from Valve’s puzzle game Portal has quickly become one of the most iconic guns in modern gaming. Firing both a blue and orange portal, this experimental piece of Aperture Science tech makes navigation a fun physics-based affair.
The Portal gun has gained a pretty big cult following online, popping up in several fan-made games and mods. The Portal gun makes any game instantaneously more fun, despite its non-lethal ammo. Eventually, the sequels added in even more portal options, but we prefer the original two-portal version.