In Quake 4, the Lightning Gun or just simply LG is an experimental Strogg Weapon that fires a single, continuous beam of lightning at a target. The Lightning Gun doesn't need to be reloaded, making it easy to use. However, it does burn ammunition at an insane rate.
It can be obtained in the level Recomposition Center, where it is also tested on a captured Marine (with a deadly result). Interestingly, this handheld Strogg weapon is never used by Tacticals, even though it must have been designed for them as they're the only Strogg carrying external weapons in their hands. The mounted version of the Lightning gun however, is found on some boss type Stroggs.
This weapon, along with Dark Matter Gun and Rocket Launcher, can be found only once, the rest of the time you will only find ammunition.
In Enemy Territory: Quake Wars, it is the Strogg version of the machine pistol.
Upgrades
Chain Lightning - Just before you take over the bridge in Tram Hub Station, a tech marine will upgrade your Lightning Gun so that enemies near your target will get electrocuted as well, if the Lighting Gun doesn't kill them, they will be stunned. This upgrade is not easy to notice since it will not change the appearance or the operation of the weapon.
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