Sector delayers will hold the tappet plate open longer, but not pull it back any further.
If the hop rubber was causing issues, it's usually because the rubber is installed incorrectly or incompatible with the chamber. Symptom would be a BB JAM due to the BB not able to be pushed through the hop rubbers seal lip.
So if the symptom is that a BB isn't feeding into the chamber at all, it's likely an air nozzle/tappet issue if you're ruled out the mags.
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