SKD G18 Feeding Issues

I have a problem with my SKD G18. It only spits out gels when it’s turned upside down. Was wondering what the problem is?

If you haven’t changed anything, try smaller gels.
It has a tight barrel.
If you’ve taken the gearbox apart and it was fine before, the issue may be with the gel retainer ring at the bottom of the gearbox.

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