Does the forearm number match? If it does my guess is that a set of donor barrels were mated to a replacement receiver that used the stock and we don't know about the internal parts, but that would seem like a lot of trouble. If that forearm number was ground off also, then there is something rotten in Denmark.
It is not illegal to move a serial number from one place to another as long as one uses the same serial number. But replacing one shows something is up, as in being stolen previously. But they must have used the stock serial number as the basis for the new numbers. I thought something was fishy with the cut off barrel extension. Calling Sherlock Holmes.
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