Aliens Pulse Rifle Magazine (allows 9v battery).

thingiverse

This remix allows the magazine to the pulse rifle to hold a 9v battery, with the wires going out of the slot on top. In the event you go with lights, sounds, motors etc, you are going to have to find room to put everything. This solves one of those issues. no supports needed i printed at 40% density (probably overkill but I like things durable). Enjoy PS this was remixed in Microsoft 3D Builder (free from Microsoft Store).