Brent, it does look a little longer like it's been extended. Doesn't look like the blue took well there either. Maybe some odd welding in the past. Looks like the safety and set trigger have been worked on. Does the action look slimmed in the back ala Zischang?
Bob, I am no Borchardt expert, being that I have owned exactly 1, but I think that tang is obviously a separate piece. Mine is similar on my Borchardt Schuetzen rifle. The tang being replaced to accommodate a tang sight of course. In this case, the tang does not look in keeping with the rest of the rifle which makes me think someone made a second tang and did not do the rifle justice.
The blue is wrong, the screw is not regulated, and the tang does not fit flush with the receiver.