I have a couple of inexpensive radio controlled tanks that have a laser tag system - each has a limited rate of fire, and a detector which causes the tank to 'die' (until it is reset) when it has received enough hits, and there are various sound effects when the tank fires, registers a hit or dies. Each tank is about 5" long and runs off a couple of AA batteries. Is that the kind of thing you're looking for? It would make a fun project to make your own, but if that is all you want then there are cheap toys available which provide this. I suppose it would be possible to take the electronics out of the tiny hull and put it in a bigger chassis if you wanted something larger scale.