Drew,
I don't know what that rib is on those two Elsies, but it is not a swamped rib. It is a flat rib with some type of odd raised portion at the breach. Hard to really know for sure without seeing the entire length of the barrels, but they appear in the photo to be flat.
JR

Last edited by John Roberts; 05/24/20 12:59 PM.

Be strong, be of good courage.
God bless America, long live the Republic.