AI cannot be made to recognize whether a piece of gcode is intended to produce a piece of plastic that is intended to be used as part of a gun. It would need to simulate the machine that that gcode is made to run on, and then simulate the gcode running on that machine, and then analyze the simulated output of that simulated 3D print.

At best, it can arbitrarily decide to decline print jobs. Which is of course the whole point, because anyone with a printer would need to bypass this filter, and bypassing this filter would be against the law.