Might have been a failed or pre-Plasma effort at IS BA hunting . . . the 3 weapon types, Ultra, ERML, LRM10, are going to put 5 or 7 pt hits for everything but the LRM which will be variable. Some of the mobile IS suits will drop from a single 7 point hit, but a pair of 5s is going to take down a lot of the regular IS medium suits- Purifiers, IS Stds, Cav/Raiden, GDL Stds, Acheilius, and Longinus. It will also do that damage at beyond most the ranges those IS suits can really hit back.
And unlike a Plasma Cannon equipped design, its also going to put out damage on mechs rather than just heat.