Sorry, with out this rifle in my hands, I'd have to say "I just don't see the grind marks or the flatting it leave behind".
Here is a very typical look of a ground off barrel shank.
Use photo below:
The spot to look for first is,
1) The ends of the barrel shank. It will show if it has been ground at all (notice left of the first digit (2) of the new scope number).
2) The opposite side where the barrel mates to the receiver. That usually shows because the receiver is a little larger then the barrel and they sometimes "nick" the receiver a bit.
3) Notice the grain of the barrel shank. After the new scope number, you can notice the grain of the metal changes. To the right of the scope number is the original finish grain), under the scope numbers the grain is different (smoother).
grindmarks1.png
The rifle in this post has none of those. You will always see at least one of them. Sometime it's hard to see in a photo, and other times not. This is why I am saying I'd have to have this rifle in my hands to say one way or another. These are very hard things to teach over the internet. Seeing it in your hands makes it become more clear (if you know what you are looking at.
You can't make up a new "theory" for each one that comes out, not unless you have some evidence to back it up (more examples). If someone held a gun to my head and said I had to guess, I'd say it's probably real because of the lack of the proof marks on the side (they are up high like a typical sniper).
I can't say for positive on this rifle, but I'll stick with....????? ..........can't positively say. (unless you want to send it to me to look at).
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