Originally Posted by montenegrin
That rifle barrel configuration is highly unusual; I don't remember seeing anything similar on a Ferlach gun.

You have noted the rifle barrel being guided in two brackets. Hence, very likely a "thermostabiler Drilling", and I do not whether it predates Krieghoff, whose TS and Optima have become closely associated to this desirable adjective.

The ported barrel however appears quaint to me.

Carcano