Azlann, most likely a BB or spring tension issue.
Try different ammo, like madbull or green devil.
If that doesn't work, buy the MAG brand mag springs for ptw mags. Run ONE systema spring and ONE MAG spring in each mag (the mags will have 2 springs in them).
Usually fixes most feeding issues, although a lot of ptw owners tend to just load their mags to 70-90 rounds.
Ironically, you can run into tension that's too low OR too high on systema mags. So that's why you run one weak and one strong spring.
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