You are talking about the black nozzle carrier in the rear of the slide sticking in the inner barrel when the slide cycles then pulls out? If so, both my G19s do that, and be happy that it does. As long as that part retracts fully into the slide you are fine. Wipe a small bit of oil around the end of the nozzle, that'll help. Worst case is having that nozzle carrier stick full outwards.
Overall, don't be shy about giving your GBBs a good oiling every dozen mags or so, they will be happier than never being oiled. Just about every GBB problems I've seen on here that doesn't involve a broken part, oil is the simple and reliable fix.
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