This is the newly added Dom Heavyarms, you can get it in the current limited missions, and It's not bad at all. it trades a dodge and a little bit of mobility and melee armor for FOUR instant staggering weapons, and Balancers, on top of not being a slouch with the boost speed. so you can get surprisingly aggressive with this thing. Although, sadly, the subweapon AA rifle takes 5 consecutive shots to stagger, which is a shame, but who really cares when the rest of the kit pulls so much weight, treat it as something to throw out there when you can't get in.