I can’t add much to that, but it is interesting the barrel markings on the rebarrel are slightly different. IBA-S (I’d guess Schneider barrel?) and it has the twist marked (1:10)
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ETA: reference pictures from CMP barrel markings.
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Say that as well and I'm guessing that it is an IBA replacement barrel. Obviously, any gunsmith can hang a barrel and stamp it any way they want. The main thing that's going through my head is that there can't be a collector that's stupid enough to pull the original barrel with the original sniper paint and hang a brand new barrel. It just ruins the value of the rifle.
Another option is that the Marine 2112 armorers pulled the barrel, installed a new barrel, and reproduced the stamps the best they could (with some differences). This makes more sense than a civilian collector doing the work, since the barreled action looks like it has also been refinished. The current barrel and receiver lack sniper paint. This is because the painted barrel was pulled and the receiver was cleaned off. The barreled action looks like it has a black oxide finish, and not the coating that IBA put on the XM3's. A civilian owner would care about the paint and finish on the receiver, IBA and the Marines don't.
Unless the seller has information for the rest of us, all we can do is speculate on what's going on. One way or another, that rifle isn't anywhere near the $40k listed price! Even with original kit and PVS-22, that rifle is worth far less than all other USMC XM3's, it's literally now the bottom of the barrel. It might be a $20k kit with everything, or it might be worth even less than that. But it's not a $40k kit.
