The HW is pretty nice, although the LW is an overall better weapon.
LMG is pretty beast if you use it defensively. It's not a full auto sniper with 100 bullets per magazine like it was in the old days, but it's still beast in close quarters.
Since the KP5 was nerfed, the LW has pretty much been Valors premier weapon.
As far the the M31 goes, I only use it in laggy games where I have to put 20+ bullets into a hockeymask bozo to get a single kill or assist.
When did they nerf the KP5?