See if there is any movement on the release button. If so, get some silicon oil in there and work it back and forth to see if it resets itself. Could just be stuck cuz of no oil, or it could be jammed in there.
Case in point, of all the questions/problems on ASC regarding GBBs, 90% of them are 'lack of oil' related. If there is no broken peices around, then oil is what's needed.
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