The recoil spring bushing, to be exact (that's just what I was told, so I'm confused as to how the two would relate). I have a feeling that the problem lies in the outer barrel/inner chamber fitting, as I noticed that they aren't seating flush with one another. Even after tilting the chamber to slide it in, once it's in place it isn't quit clearing the lip of the outer barrel. I'm guessing that it's designed to remove the forward/backward shifting motion altogether? If that's right, then should the entrance of the hop chamber be sticking out more than the entrance of the outer barrel 'chamber'?
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