Runs, if I read your statement correctly and you stated approximately 7" from the muzzle, that top rib there should be free from solder there. I'm guessing someone re-soldered it and did not clean it up right.
The top rib extension at the breech was brazed.
Also I would have someone check the bores for honing, they should be .729-.730, especially on a gun that ended production in 1912.


David