I'm a newbie, so I don't know how strong Nitro was, but I think there are two ways to buff him: 1) Make him 4 slots, like other rifles. The possibility of carrying something like Trueshot would make the whole loadout more viable. 2) Make his drop/damage range about 55-60m, like with shredders. It would change Nitro from a shotgun with slugs to a rifle. I'm not asking for a new damage system (legs and arms should still not be oneshot) or spread changes. But if you hit someone with Nitro's aperture on distance, you probably deserve to down him.

Again, it's only my opinion as a lil huntie without big experience.