Gnoahhh,
I think my dad’s G has that also. Basically just used an original sight (or replacement sight) as a filler and cut the top of the sight off and shape it to whatever you think looks good.
On my dad’s rifle, the front and the rear of the sight was shaped to match each other- kind of like < > the dovetail base (basically in the middle underneath) is kept the same.
My brother now owns it, maybe I can get a photo.
