if i were building a shooting gallery, which actually sounds kind of fun, i would set up the targets in groups, each group connected to a microcontroller. ...Also, target-to-base communication could be a simple 1-way communication. The targets don't really care about the shooters score, but only if they have been successfully shot at or not, so the base doesn't need to communicate with them at all.
I'm just trying to come up with a cool design for the gun. I'd like to create it totally from scratch and be a unique design.