I play around with airsoft some, In the past before I got into IR tanks I just used some .25 or .28 G&G perfect spheres I have handy. .20s would probably be ideal though since the tank airsoft unit doesnt have anywhere neat the piston volume as an actual airsoft weapon. Stay away from .12 gram BBs or anything made of clear plastic as they have a tendency to shatter in an airsoft mechanism and ruin it.
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