Yes, you can see there's nothing left of the sight mount or bayonet lugs there...he's looking for an original era barrel...
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More than once the lugs have been turned off and the barrel left full length, but I'm inclined to agree that is has been, though not certain.
Easier to ask than to guess, though guessing can be entertaining at times.
The receiver group would be the starting point but the rest isn't junk and could reclaim some cash towards the rebuild... Maybe closer pics of the receiver, maybe stripped to the basics...? Don't strip the bases though.