That double is one by H Burgsmuller & Sohne.
https://www.germanhuntingguns.com/archives/burgsmuller-h-sohne-kreiesen-am-harz/I was fortunate to snag it.
I was pleasantly supprised at how well it was regulated using the factory Hornady 300 gr. Interlocks.
Minute of Hoglet @ 50 yds.
it is drilled and tapped so I will most likely mount an RMR.
ya!
GWB