[lurkingknight]

bbs falling out is normal. The tube that leads from the mag to the hopupwill not retain them, and the floaters are pushed up by the bbs below.

next time it dry fires, try shifting the mag around in the magwell, does it tilt, does it push farther up? sometimes a slight angle change will help the flow of bbs out of the mag and up the tube.

Also if it's a midcap, fill the mag and hold it rightside up in a bag or large container and open the retainer that keeps the bbs in, do the bbs fly out or do they just dribble out? the faster they empty, the better. If they just dribble out try a different brand of bb.