Dewey youre not wrong but I have to believe you have made enough gun screws from scratch to agree that every one requires specific timing and torque. For example, if the heavy handed knuckle dragging excuse of a gunsmith overturns a sidelock screw it will pinch the locks and cause problems. Unlike the British best there are always extra threads on American and many Euro screws, ripe for overtightening!
My suggestion to Gil was to check that the screws installed in the new stock might not be tight enough or they might have been overtightened. The trigger plate may even need to be inletted deeper to allow another turn on the rear tang screw which has the odd round head. Checking their position against the original wood stock would help determine the appropriate number of turns. Most model 21 upper tang screws sit a little below flush, I doubt they were dressed down by hand.
