Thanks. Now that we know it likely is a low-grade Belgian, I am curious about the steel used for the frame. The front section I loosened looks looks like a casting from the inside. I noticed two little bosses that protrude forward on top of the breech face. Would they be to help protect it in case a cartridge pin broke or the hammers fell on empty chambers? The breech faces have some pitting. What is the accepted term for this type of action?