Took the action out of the stock to inspect the receiver for any bending or cracking and I didn't really any signs of it. The stock seems to have a minor chip by the trigger and it almost appears like someone messed up the spanner holes on the recoil lug. I take all of the markings found on the underside and right side of the receiver are inspection or forge markings?
Picture 185712 -- I can't tell, but is there any wood
behind the crossbolt? I see shadow there. It could be that the wooden "braces" or "buttresses" that go up against the crossbolt to support it against recoil, have sheared away. It happens, it was a known problem even in WW2.
This photo.
If so, that's not good. You should not shoot that gun until that's been corrected, because the only thing taking recoil are the head of the crossbolt and the nut (with the two drive holes which you mention) on the opposite side. That crossbolt is being hammered back with every shot, and eventually will split the stock, which is very thin in that area, with the cracks originating from the round crossbolt head and nut holes.
There should be wood on either side (front and back) of the crossbolt, more or less flush with the top of the crossbolt.
If that wood has broken away, it can be fixed / replaced by a couple of authentic-looking and strong (like the original) laminate "dutchmen." But setup and milling are a bit complicated.
That wood breaking away is why some of the later guns had a different cutout on the receiver to drop over that crossbolt, and the crossbolt was moved forward to give more shear surface to the wood supporting it. The load would be distributed over a greater area.
Here's an example -- the brace on the left side is still hanging on but is obviously cracked and compromised. The one on the right is completely gone, exposing the entire face of the crossbolt on that side.
And a photo of a repaired stock. I could have stained the patches a little redder but I'm happy with the way this turned out.
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