The term "K22" covers a pretty wide swath, from the Outdoorsman, K22 Masterpiece and Combat Masterpiece (with numbered equivalents M17 and M18, respectively), to the current 617. Barrel lengths ranged from 4" (Combat Masterpiece, 18, 617, and an occasional 17), 5" (rare 17), 6" (Masterpiece, 17 and 617) and even 8 3/8 (17 only, I believe). Barrels were only half-lugged until the introduction of the full-lug 617 and reintroduction of a full-lug 17 (which was fairly shortlived). Front sights were Baughman quick draw on the M18 and Patridge on the others. Capacity ranges from a traditional six to ten on some current 617 models (as well as a re-reintroduced 17-8). A few full-lug 17s and 617s sported aluminum cylinders, and sold like cold cakes. All had adjustable rear sights, with the exception of the fixed sight M45, which I have never actually seen. Some had target triggers and target hammers, some narrow versions of the same. All were blued or nickled, exception for the stainless 617.
As you can tell, there are a lot of variations. One thing that is true about K22s is that they are wonderful guns to shoot, with smooth actions and lovely k-frame balance. Even the modern 617, with its full-lug barrel, stainless construction, and much-maligned MIM parts, is said to be a hell of a shooter. If you wanted to buy any of these guns, I would not be the person to talk you out of it.
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