It looks like a Laser Rifle, but without the outer casing and heavily modified with unknown parts. The focusing chambers have been all but removed and the battery has been heavily shunted into the mechanisms around the laser. The laser emitter itself seems much smaller, too.
When "fired", it seems to teleport the user right in front of the target, with some kinetic energy added so that the user and target end up colliding. Based on a test in space outside one of the Sword's airlocks.
- Pancaek Nilys - Buyer, Current