What is the section of threaded screw hole between the barrels under the missing top short rib? Did someone attempt to repair a loose rib with a screw instead of soldering? As I recall both barrels that blew up at 29,000 to 30,000 psi in Sherman Bell's Parker test gun ruptured where the barrels had thin spots from extractor or extractor retaining screw holes.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug