SKS heavy barrel but strange grinding marks

So, if the receiver hadn't been ground down, would the stock cross-bolt interfere with it? Is it a matching stock? It looks like the cross-bolt sits farther to the rear than it should for proper stock fit, and a previous owner (not Ivan, the ugliest arsenal work is better than that) relieved the receiver to get the stock back on.
 
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Welding on a barrel is a huge NO NO! and I would not deem that gun serviceable if I inspected it at work.
 
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