Most obvious giveaway to me is at the front of the barrel where you can plainly see where the original front sight was removed. Original 03a4's never had a front sight installed, hence the Parkerizing was continuous at the sight base. Yours shows the original bluing underneath.
Scope on yours is most likely a Weaver 330 Commercial with screw adjustments. All Weaver scopes for the military had "click" adjustments.
One other note: the serial number on yours looks to be "Z4001" Z-prefix rifles are rather rare (only about 2,920 made), and they always had a 7-digit s/n, Z4001083 being the first in the series, ending at Z4002980. Yours is just a nice clone....
If the seller did not disclose that this was a re-pro, I would be skeptical at doing business with him again. Just MHO....
--728shooter