It looks like one of the non-cataloged 99 configurations that were put together in the mid-1980's from whatever leftover parts they could find in the warehouse.
I sure wouldn't pay that kind of $$ for a non-cataloged configuration that didn't have any provenance, not even a factory letter. Looks you'd be paying 50% for the rifle and 50% in the hope that it is something more special than it really is.
