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I compared the wear on the bolt to old photos I had and I could see the difference. It was grinding itself down against the locking surfaces. If you skip to the end of the video I have some photos of the damage.
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Sorry I didn't see the photos at the end of the video before. That is pretty nasty looking for 1,000rd. I have a WASR with probably 7k-10k rd through it, and the locking surfaces are still smooth and well defined.
I wonder if the bolt casting they used was made from a virgin bolt, which may have not had the final angular lug grinding done. If the front trunnion casting had it, it may be chewing into the flat lugs on your RAS bolt as it locks into battery. Just a wild guess. You said that the bolt originally had flat lugs, I have no reason not to believe you - but the ground lug face angle is so slight that many never notice it. .
Whatever it is, it sounds like you're done with the rifle. Too bad, the RAS looked nice when it appeared on the scene.