After zooming in on the pics I believe the thing to look at here are the markings and what not on the side of the barrel shank. Not sure what to make of it."Pre-series" means what exactly, in the seller opinion? Pre-production trials? Clearly rubbish, just trying to figure out what the man is trying to fake here.
They appear to be the import mark of the German company Waffen Schumacher GmbH ("WaffSchu"). The PU snipers imported by ATI a few years ago took some sort of detour through that company.They are (modern) European proofhouse markings of some kind. Probably German, but without better pictures it is hard to say.