We finally graduated to bb bun wars, too. However, prior to that, our best bet was to get a piece of aluminum tent pole (maybe 16 inches or so) and saw the barrel off a plastic squirt gun. Little black (electrical) tape to attach the aluminum to the squirt gun grip and stuff an empty 20 gauge shell in the back end and, voila, a PERFECT bottle rocket gun!
Man, we had some great times back then. I believe we all grew up with each and every limb (eyeballs included) intact.
