I call mine a model "937", and it works just fine. Fitting up a new cylinder from the factory is not a job for the neophyte wannabe 'smith, however.
For safety's sake I practice with light 9mm reloads, or reinstall the .38 spl. cylinder. The gun has digested a couple wheels full of Hydra Shocks however, to make sure it functioned properly, and hit somewhere near POA.