Railgun (Immersive Engineering)

The Railgun is a ranged weapon added by Immersive Engineering. It shoots various items as ammunition.

The Railgun isn't loaded; it will automatically grab ammunition from items in the inventory.

Holding right-click with the Railgun in hand will "charge" it (not to be confused with Redstone Flux (RF) charging). Once the charge level (the number on the Railgun in-game) is at 99, it can be released. Each use of the Railgun cost 800 Redstone Flux.

Note the icon in this picture is invisible due to rendering issues with NEI.

Ammunition
Items, usually rods and bars, are used as ammunition for the Railgun.

Upgrades
The Railgun can be upgraded through an Engineer's Workbench. Two slots are available for upgrades, plus an additional slot for Shaders.