,Atlas Arms ran Ads in American Rifleman in the 1960s-70s for both Belg, Italian, and Spanish made Replacement Bbls. I Re-bbld sevaral Winch, 21s 12&20b.I also got my Bbl'Blank-Tubes from Steve. My 1st'Sleever' was a VH Parker..Ahemmmm. not tobe spoken abouteveragain!!!!!(I always wondered how do you pull in the front of the tubes when they are3/4" apart??Sort of like a 'Ducks-Foot" boarding pistol from Nelsons days!!!)I was told'Stick to Stocking, you will never be a Bbl maker as long as you have a hole(you know where)....They were good steel,a L/Pigeon shooter did have a Churchill 12b'Sleeved" with them,I belive it was by the Swiss Gunsmith Mr Kurt Blumer,Late of Marshall Fields Gun Room, c1969. .040"chokes in both Bbls. 2.3/4" chambers,and not Proofed' Gun was at a L/Pgeon Shoot in Fla.Jan 2000. still going strong. FSP..Have you a copy of William J Helmer.s"The gun That Made The Twenties Roar"? He and I were Good Buddies. In fact He made me a member(IN good standing)of his John Dillinger Died For You Society' Horace Naismith, Founder. We had several'Good American Built Doubles" that had made their name in Chicagoland History, Double'O'Buck was very popular from Cyl.Bore 16"Bbls.I think there is a Ithica 4E DB(With the afore mentioned modifications) in a Musuem in Nashville, Indiana.Baby-Face someoneorother'tossed it from a speeding Auto as he left a'Shoot'(Dont know if it was a'Sporting Event or a'Running-Person' Shoot that was a popular Shotgunning Event in that Priod of American'Gunning History)Would be interesting to check out the Sr.# with the Ithica Records!!!!Smile, Your on Candid Kamera,(Too much walnut dust on my Wheaties this AM. ..........C/C