I hate to ask the obvious question, but you say you've only had it a couple of months and never fired it. The stock is now off for checkering? Was it sticking when the stock was on? If you tightened the screws until they bottomed out with the stock off it may well have closed the gap that would have been there if the wrist of the stock was on for the screws to tighten up on. Tightening it past that point may cause it to bind.
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