Agreed: non-breaking plastic can make these types of guns overpowered compared to steel ones. Aside from making the suppressor vulnerable to breaking with use, there’s nothing I can do about it at the moment: there’s no code to fascilitate that.
Might not be the improvement you had in mind, but I did introduce a requirement for Homestead’s polymer (refined from common plastic) into the recipes. It also goes to justify how all-plastic guns can even handle more than 50 shots without breaking completely: dense, high-quality sci-fi-ish polymer compound that’s designed to withstand these kinds of pressures.
It’s not stated in-game, but polymer is used for barrels and firing pins, hence their ratios in the recipes.
I just have to update the latest release now. Will happen once 0.3 of Homestead is live.