Mike and 400,
Besides the bottom lugs, it has an extension at the to[ that locks into the breach, similar to an LC Smith type.
It does have a 9.2 on the rifle barrel, could this have been the original caliber?
I think I need to ask the seller a bit more background about the gun.
By the way, non- of the s/s cape guns you showed me look anything like this gun. I have pictures, but I can't remember how to post them. This gun looks "more Modern" .
Just a side question,
400 where did you get 62,000 psi for the "flanged" H & H mag. John Taylor in his book list it below the belted version at 17 tons pressure.