in my opinion, they needed some kind of nerf anyway. Having shotguns that just spammed the entirety of the map at a crazy rate of fire got pretty annoying and wasnt good for the game as no skill was involved whatsoever. (People just stood still and spammed them to great effectiveness)
I do realise that dual models are basically useless now though and there were (and still are) weapons that need nerfing more *cough*'pump shotty *cough* natures destroyer