Though I knew the difference , I always wondered WHY the two different model numbers. After all , a Model 19 is a Model 19 (or 27,29,)whether it has a 2 1/2" , 3" , 4" , 6" or 8 3/8" barrel , ramp or patridge front sight.
Also , there have been Mod.18 stamped guns with 6in barrels and Mod.17s with 4in tubes.
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