I measured my revolver barrel. From cylinder to muzzle, the barrel is 3 1/2 ". Is that what is called a 4" barrel? If so, why? Also, why are these revolvers so revered over other .22 revolvers? The only difference I can tell from others I have is the smoothness of the trigger pull.
If you have an unaltered, 3 1/2" barrel J frame .22 revolver, it is more likely an alloy frame/cylinder model 43. There is some variability in barrel lengths, but usually not 1/2".
There is a lot to like with these - quality, compact, light weight, decent adjustable sights, and the trigger pull as you mentioned.
tell me more about the model 43. I thought this revolver might be an alloy since it is light and the cylinder doesn't seem to have the luster of steel bluing.
It is called the Airweight Kit Gun, with a steel barrel and aluminum alloy frame and cylinder. If it was made after 1957, it should be stamped MOD 43 on the frame under the barrel with the cylinder out. They were made from 1954 to 1974. The difference in finish between the steel and alloy is normal - the alloy usually looks darker and slightly less shiny.
If you are able to post photos that would be great. If you can give a partial serial number from the bottom of the grip frame (with any letters included) we can tell you when it shipped from the factory.