Retro Robot - Water gun accessory

I wanted to be able to give the Retro Robot some bad ass gear, but I do not think a real gun fitted him. If you grew up in the 90s, you probably remember the cool Super Soakers with joy. I think that is the perfect type of gun, for the robot.

Both of the parts requires very good bed adhesion. And they must be glued together.

Retro Robot
This is only the Water Gun accessory. The Retro Robot can be downloaded here:
https://www.printables.com/model/410698-print-in-place-robot