They're not even that good.
They should have made half as many mods for the pipe weapons and doubled the amount on some of the other guns. The .44 for example is probably one of the most neglected ballistic weapons when it comes to mods. Why no .50 conversion, semi-automatic receiver so you don't need to pull back the hammer after every shot, a laser sight.
I'm only using that gun as an example because it's one of my favorites, but still.