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Put some silicon oil in the feed tube, then cycle a dozen times. Sounds like your hop up rubber has gotten sticky and is not allowing BBs to pass. If not that, then there is something wrong with your hop up rubber.
Really, there isn't enough info in your description to allow experienced techs to reply, need much more info than was posted. I mean, your description could bring about a half dozen fixes from experienced gun techs, so provide more info to narrow it down, otherwise everyone will take a guess and miss the real cause of the problem.
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