I was super stoked to come up on this at The Flea Market this weekend. It's totally sealed. I remember having this and playing it back in elementary school. That was my peak as a role player, well TSR games anyway. I later got into Steve Jackson Games in a big way. Mostly Car Wars.
Gang Busters was cool though. It was fun to pop some caps after years of swinging swords and conjuring Magic Missiles or whatever.