Another post about a heavy barrel OP has got me going on this pitch ... Recently, I saw pictures of a Colt Marshall and a Colt OP "round butt," and they looked identical. And now, I'm reminded of the heavy barrel versions. I had one of these, also a 4"er. And, in Emmaus, Pa., over Christmas, I saw a 2" Official Police. I asked about it and the kid behind the counter said it was a former cop's gun and was factory original - not altered. Information/enlightenment here? I've seen the 2" barrels listed in the Numrich pages, but NEVER for real. (Until now - maybe?) I've never seen a 6" heavy barrel, either - is there such a thing? Never seen a 5" OP, either, but they used to be in the catalogue? (Weren't they?) And come to think of it, I've NEVER seen a nickel OP, ever and I've never seen one of the newer OP Mk III's, except in pictures. Any wisdom to share here fellas? Seems to me a guy could make a pretty darn interesting collection out of the humble old horse. (Put a 8" Python target .38 and a scoped Hunter at the bottom of the collection to show what they, "grew up to be," and you'd have something unusual!