Paintball Cork
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Originally paintballs were available in 2 common calibers. The first paintguns where side-feed bolt action rifles that held 14 paintballs which were slow and tedious to load, players had to lift the paintgun muzzle up and while rolling it on it side, work the bolt and hope one of the paintballs would roll into the breech and get ready for your next shot. As with all sports, paintguns and the equipment started to develop and with that came the advent of gravity feed, constant air, hoppers that held 40 paintballs then 100 paintballs then 200 even up to 300 paintballs, whilst this was going on the paintball guns went from bolt action to pump action to semi-auto and now we have paintguns with electronic triggers and brains for even faster rates of fire. Of course to feed the paintballs quick enough the hoppers evolved from a plastic box.