At a big box store i have handled on of these and they are far from the genuine article. As stated earlier this is a newer scope system and truth be told it is a poor copy of the new system at that. The scope mounts are cast and seem chintzy compared to the real deal. plus these are mounted on run of the mill 91/30s, nothing super accurate or special. Matching numbers or not its a sales gimmick.
a legitimate one will have the letters C H stamped on the top of the barrel shank meaning sniper or as they say снайпер.
Only Tulas have the "CH" marking, but there are some legit examples that dont.
Izhevsks have no special markings to set them apart from standard infantry rifles.
The best way to spot a fake is through education.