Great heat efficiency and damage. ECM is just icing on the cake. Edit: Here's some sauce showing this thing in action.
5/5, Such a fun build to play with. Can poke out either side and give the enemy what's coming to them. Not to mention ecm is just tops. Well done.
I was never very happy with a torso Gauss on the HBR, you are forced to chose between protecting your ECM/lasers and your Rifle. Gauss in the Left Arm infinitely preferable in my experience. If not, maybe ditch the Left Arm MLas, 40 points of armor and a laser that's 30% lower than the rest of your payload is kind of a bad deal. Get some armor on your right side shield, bump up the DHS, etc.
That nipple gauss is amazing for poking though. I think the high mounts make up for the lack of a dead side.
I was running a UAC20 but thought I'd try this out for a change. For such an old build its still really good. My first two outings with it have resulted in 5 kills for 0 deaths, so it's doing something right. It hasn't been doing big numbers, but the pinpoint damage is tasty.