Originally Posted by z1r
John, your "Original F Mauser" commentary is meaningless when the OP's rifle is clearly not an "Original".

The Zastava produced Intermediate Commercial actions often used by Heym. Also used in Monkey Wards produced rifles as were their Std Length actions. The Intermediate Commercials lacked the charge hump and thumbcut. They did use military bottom metal converted to hinged.

[Linked Image from i.imgur.com]
If that top action has about a 3.25" or so magazine, that is exactly like the one on my Herter's XK3, to include the location of the serial number and the floorplate latch and the left-side-rotating scope-clearing safety. Can you tell us more about that particular action?
Thanks,
Rex