Jerry, your top photo makes it look as if there's something not quite right about the way the barrels and the standing breech mate up. Almost like the barrels are too small for the breech, or the breech too large for the barrels. Makes me wonder whether the barrels might have come off a different gun . . . unless that's typical of Remingtons??
Larry,
I have a Remington 16g ejector gun that looks like that too. I often wondered if it were a 2 bbl set 12/16 or if the 16g barrels were fitted to a 12g frame.