Is this a replacement barrel?

This is the barrel on my Brno VZ 24.
Straight taped
7x57
No markings on the barrel.
Barrel looks like a mirror.
There is no sign of the barrel having had iron sights.
I'm convinced its a replacement but I have no unmodified VZ to compare

Whatchuthink?
[Linked Image from i.imgur.com]

Replacement. Or possibly (but highly unlikely) recontoured .

Replacement commercial barrel.

21"? Adams and Bennett F14 if so.

I have that same barrel (small ring though). I was thinking of putting it on a 1640 action I have.