Here is a list of guns in Gunsmith Simulator that i can find
If i missed any pls let me know

I will only add weapons from DLC/Updates when they do release, incase something doesnt make in the final product. So if a DLC or Update isnt out, wait and come back, i will be sure to update it when a DLC/Update releases and see if everything mentioned makes it in.

I will also update the list if a gun is removed by adding it to a separate section for removed weapons. let me know if there has been any.