This is how I would imagine what the guns in Payday 2 would be named like if they were in GTA V.
One half of the names are matching with one another, while with the other half I tried to make them as consistent and faithful to the original as I could; though it could get contradictory at times.
However, as a result of me brainstorming ideas for how the guns are going to be dubbed, many of them might come accross as if a journalist/TV anchor came up with them; so inside the weapon_names.lua file - those marked with "open for suggestions" are there for you guys to offer better substitutes.
I think it will be a good idea for Rockstar's board to consider adding a few of these to the game. Who knows, maybe we could get them in the future. Or when GTA VI drops.