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Making a hollow projectile from craft foam and using "spent" bb's from an indoor airsoft place is probably the most managable thing, as the foam is cheap and the bb's are usually free as they usually get swept up and go in the garbage. Oh and basically sticking with honour system. As well the very idea of using golf balls and tennis balls is absolutely ridiculous, you will seriously harm or even kill someone doing that. Also the bb shower idea is another alternative.
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