Go into your files path: data/scripts/commands open the LUA file that says inventory and do ctrl+f and search for number 12 once you find it there will be a line of code that'll read weapontype = limit(tonumber(w), 12, 0) change the 12 to a 16. i havent figured out how to make the mod recognize the new upgrade types yet so if anyone knows how to do that i would appreciate it.