Steel ejector barrels. Very good condition, just very light pitting in right bore, could easily polish out. The barrels are very thick, at foist I thought they were 10 bore but they are 12. Plenty of wall thickness. $125 delivered
They appear to be from a first model (with swinging cocking hook) Facile Princeps.
Pity that you are other side of the pond, as I have a sleeved first model E.M. Reilly Facile Princeps although it is wildly improbable that the barrels would interchange.