Well, I had a LAW project that I started but never finished.(Seems rockets are too dangerous, understandable since I almost lost a eyebrow cause of one.)
The ammo we wanted to use though was based on the Nerf Vortex design, which was reusable (note I'm no safety expert, my right ear remembers all those firecrackers). I'll try to find the concept drawings. We also made an expendable one made out of cork.
All in all, safety wise, if you got your goggles and a soft enough head, you're good. Plus with the vortex design, it whisles as it flies, which is an added bonus.
I'll post the drawings with schematics on the 6th (tomorrow).
Always run, never think twice, live to fight another day and remember this simple saying: "You are not Superman, and you don't shit ammo out of your ass Monkey Boy!"
Only idiots throw rocks at authority. The smart ones are those that are behind authority, ready to stab it in the back.