For some reason S&W never catalogued this model and most went to a USPS contract. Basically a Model 10 chambered in 22LR this model makes a lot of sense. Just like the Colt Official Police in 22LR only the Colts are a lot easier to find. But getting back to the Model 45, to me it is a great training tool and was used as such by the Post Office and various police departments. The more I shoot mine the more I like it and it has become my favorite S&W revolver.