Another factor is that the Utica leftover parts were bought by Numrich's and sold in (I think) the early 1990s. Some were assembled into finished guns, using (again, I think) receivers and "parts guns" that Numrich's had in stock from parts customers had sold to them over the years. The offset bore .22 shot barrels could be fitted to any centerfire 220 or 219 barrel of the right model Up to the "B" models, if my memory serves, but not including the "B"s.
I don't recall seeing any .22 shot 219s or 220s or .22 shot barrels at Numrichs when I visited during that period, but then I'm mostly a hunter and they wouldn't have meant much to me. Nor did the 9mm Rimfire Shot barrels and guns that I DID see.
