Ive had only 1 chopped KSC .30 BB out of probably 100 mags of gaming and testing. Not one of my Systema mags has feeding issues.... I just make sure to remove all the BB's at the end of a game day and store them with no tension on the springs, similar to what you would do with an AEG spring.
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Happiness comes from belt fed weapons!
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SIR - South Island Rangers
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