Honestly, the magazine idea is pretty good. If you really wanted to you could release the spring holding the bb's inside and spray em out at someone. Granted, it wouldn't be very effective or have much range at all, but why not??
Hahaha man this is gonna be so much fun! KA-BAR, you should totally organize events like this more often!!! Like once every three or four months just cuz springers are totally awesome and fun to shoot.