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I know midcap mags should never be loaded to the max capacity, always load them to about 150ish rounds or less.
If you load the magazine to the max 170 rounds, the spring inside the mag tends to push all the bbs out at once due to all the stress and tension being created when inserting the bbs.
A friend of mine though has had issues with MAG brand magazines for P90s. Might just be a lemon.
My suggestion, pick up the KA midcaps if possible, or just don't load the mags all the way.
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