Coilgun
From benscondo.wiki-rpg.com
This weapon has been encountered in the hands of a Red Hand power armor soldier, one of the Gurov-archetypes. It is long (~6-7'), and is carried over the shoulder, like a rocket launcher.
The weapon apparently has a very long effective range, at least 600m while being fired on the move. It also appears to have cause some small area-of-effect damage on impact with some objects due to kinetic energy dump causing explosive fragmentation.
This technology has not been researched yet. The Elma resistance does not have one of these weapons in its inventory yet.