No, they are not interchangeable. I was able to sneak a takedown on an unsuspecting Big 5 employee last night and the barrel mounting system is different.
My father's Ithaca 37 has two threaded sections at 180 degrees from each other (at 12 o'clock and 6 o'clock), with smoothe and smaller (in diameter) sections in between. YL-12, by Brolin Arms, has 2 lugs instead of threads at the same positions.
[This message has been edited by Destructo6 (edited April 24, 1999).]
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