High cap mag? Or mid cap?
Same mag you were testing in the basement?
-If you over fill mids, you can force them to double stack and put too much resistance on the spring (the recoil from the shots will shake spring/bbs up enough after every few shots).
-Make sure the mag is sitting flush to the receiver. If it's loose, then it can miss-feed.
-Check to make sure your hop up adjustment isn't too tight, bc it'll keep your bbs from getting through.
-don't reuse your bbs after you've shot them through.
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