X277 "Viper" Magnetic Rail Cannon

The X277 "Viper" magnetic rail cannon was a weapon utilized before the Great War.

Background
The only known prototype of the X277 "Viper" magnetic rail cannon developed for the United States Armed Forces by West Tek. Also commonly referred to as a "railgun," the weapon uses energy cells to propel a depleted uranium round across a series of magnets, discharging at a high velocity.

Deemed too costly to produce on a mass scale, the project was abandoned in 2044. It was displayed as part of a museum exhibit on loan from the International Ordnance Museum at the Museum of Technology in Washington D.C. alongside weapons and ammunition used by the military in past conflicts all over the globe.

Appearances
This X277 "Viper" magnetic rail cannon is mentioned only in Fallout 3.