English: The Smith & Wesson K-38 Combat Masterpiece Revolver Model 15 is a six-shot double action revolver, with adjustable open sights, built on the medium-size "K" frame. It is chambered for the .38 Special cartridge and is fitted with a 4-inch (100 mm) barrel, though additional barrel options have been offered at various times during its production. Originally known as the K-38 Combat Masterpiece, it was renamed the Model 15 in 1957 when all Smith & Wesson revolvers were given numerical model numbers. Model 15-7 was introduced in 1994 with the following changes - Synthetic grips introduced, drill and tap frame, change rear seat leaf, change extractor.