It's a Nazi rework of an original rifle with a mismatched stock. (at least that's what i'm told, i'm no expert by any means...)
You actually have seen it before Chasdev, maybe 4-5 months ago.
There was a fairly long thread concerning it, i believe Hambone said that's what it was. (Nazi reworked with original parts).
I just thought it was a pretty cool rifle, and i was able to trade for it with a buddy.
Nice rifle, thanks for posting it. I don't know what it is about the Kar98a's I like so much. Maybe it's just that was the first military rifle I started my collection with. Sort of like your first car.