Worse still, gcode is literally just telling a machine which motors to move and how much. You need something that can interpret those instructions (thousands of lines of code even for pretty simple prints) correctly and “draw” the shapes it is making. There are a lot of printers out there that do not have the hardware on board to do this.

And that is all ignoring the absurdity of recognizing shapes as “gun parts”… The hardware hurdles pale in comparison to the software ones.