The electric plasma rifle is an energy weapon in Fallout: Brotherhood of Steel.
Need to take out an enemy from a distance? Is that enemy wearing armor? No worries. The plasma rifle, which offers superior accuracy and a good rate of fire, has you covered for all your killing needs.
Plasma rifles or plasma casters are high tech weapons firing superheated bolts of plasma, powered by either microfusion cells or heavy energy cells, which find numerous applications in military and industrial fields. The bolts form into toroids in the plasma chamber, which are then sent down a superconducting barrel, propelled by, and in some models stabilized by electromagnetic claws upon exiting it. The primary damage mechanism of plasma rifles is thermal transfer, causing serious burns to soft targets and melting hard ones. In extreme cases, the plasma can cause spontaneous dissolution of the target, including separation of soft tissues from hard ones or wholesale molecular destabilization that turns the target into a viscous green fluid.
Initially, the weapon was a bulky, industrial plasma caster, manufactured by Winchester Arms; while it performed admirably, it was expensive and required specialized training to use. However, later developments for the United States Army would lead to a more compact design that was cheaper to produce and easier to train for, perfectly suited for urban warfare.
The electric plasma rifle appears only in the city of Los and the Secret Vault. It's to be manufactured using technology contained in the Secret Vault. It's equipped by the most important ghouls of the Church of the Lost and some super mutants of Attis's Army.
A good weapon for the beginning and the middle of Chapter 3 but surpassed by other weapons in the end. The weapon uses a raygun shot. It's very accurate and burns (by electrical burn) the target with radius contact. With the skill Energy Charge, you can charge it for the equivalent of three rays for three times more damage and ammunition.