A high-tech weapon from Valve Software's First-Person Shooter, Half-Life.

You find this gun in the latter part of the game, in a lab area. It has a very high rate of fire, shooting beams of energy that do 20 points of damage each. You can also charge up the weapon to a devastating effect. It can gib most creatures, and can take down a helicopter in two hits.

It shares ammo with the Gluon Gun.