S&W made K-Frame .357 Magnums from 1955 when the original Combat Magnum (Later named the M19) was introduced until just a few years ago when they stopped making K-Frame .357s.
The models were, in numerical order, the M13, a blued or nickel fixed sight version of the Military and Police line. Barrel lengths were 3' or 4". The aforementioned M19, blued or nickel Combat Magnum with adjustable sights, barrel lengths 2 1/2", 3" (kinda rare) 4", and 6". The M65, the Stainless version of the M13, and the M66, a Stainless version of the M19.
These are still readily available on the used gun market and make great carry guns. They are some of my favorites. If you plan to shoot A LOT of heavy .357 Magnums in them, they will probably need service at some point. This is actually the reason they came out with the stronger L-Frame.
They are very interesting revolvers, and some of my favorites.
Jim