You will notice that the rear tang screw is not screwed in all the way. That may be the issue is things might just be a little loose.
Being the the stock looks like it was messed with some for fit, I wonder if maybe the stock has been bent in the past which may be causing some of the issues too.
Hard to tell exactly what the issue is there, but I am sure that some time with it taking it apart and testing fit of the different parts individually will point you in the right direction.
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B. Dudley
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