Stock crudely carved up to take a K98k-style sling ??? Not any kind of arsenal or factory work.
In the sense that what Bubba does is often highly unusual, I suppose you could charitably call it "experimental".
Please explain to the seller that FUBARing a good stock does NOT make a rifle more valuable.
And overstamping the recoil plate proves nothing except that the perpetrator had access to a set of stamps.
The lack of enthusiastic comment by the real carbine experts also tells me something. I suspect they are just being too diplomatic to write "yeuch".