“A modified particle cannon firing crisscrossing beams.”

It's a Shuriken neutron blaster with crisscrossing firing lines and a slightly higher maximum damage, ok? You'll only find one of these in the game, in the wreck of the Slicer's gunship (if you're extremely lucky), and usually it will be damaged (and thus useless). Technically, this is slightly superior to the Shuriken, as it's possible to concentrate fire on a single segment of armor. In practice, it's not really worth it. but if you find an intact one, and don't have a better weapon, go ahead and use it..it's not bad in charon if you're careful.