Let me put my two cents here regarding this.
Fallout 4 tried this and made the worst possible firearm settings in a Fallout game ever; they managed to make guns inverted (bolts on the left side, ejecting on right, SOMEHOW), makeshift scopes made of nails on sides, .38 Special and .308 guns look exactly the same, when they're makeshift and one caliber has triple the pressure of the other, and what is worst of all, when you upgrade your guns, they don't start to look "normal", they appear even MORE jury-rigged than before.
The Pimps take this to a whole new level. The level of jury-rigging of the weapons is just obscene, and it makes sense to a certain level, but it gives no options for the players to actually use something that looks "used", but "normal". There are many things the pimps could focus on to improve their game, and its obvious that they should have focused on guns and weapons earlier, instead of trees and animal fur.