I believe Brian is likely correct in stating the root cause of the issue is that the stock is allowing the trigger plate to be tightened to the point it has closed the necessary gap between the trigger tops and the safety bar. It would not be my first choice to remove metal in order to open this gap back up, but to add either a shim of some firm, non-compressable material, or inlet and bed in a new piece of wood, then re-inlet to the proper depth. If the stock is oil soaked to this extent, or has shrunk, what seems tight now, may not be tight in a few years.
I have a favorite belt, which, over time, has become shorter, and my fix was simply to order a new belt from "YourTack.com" Now I'm using the fourth hole instead of the first hole. Truth is, I know I didn't fix the problem. I just 'adjusted' for it.
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