S&W K Frame Model 15 Combat Masterpiece Thumb Piece and Nut Blue Steel .38 Special Used, Part# 15179B N79 629-4) use a different yoke

629-4) use a different yoke retention design and are not compatible

This hammer is configured for rimfire ignition and is not interchangeable with centerfire J Frame hammers (e

One (1) Smith & Wesson Model 51 J Frame hammer

Designed specifically for 4-inch barrel Sigma models in 9mm and

S&W K Frame Model 15 Combat Masterpiece Thumb Piece and Nut Blue Steel .38 Special Used, Part# 15179B N79 629-4) use a different yokeSmith & Wesson K Frame Model 15 Combat Masterpiece Thumb Piece and Nut, Blue Steel, . 38 Special Part# 15179B Used OEM Factory Part K Frame Restore the cylinder release on your Model 15 Combat Masterpiece with this genuine Smith & Wesson factory thumb piece and nut in classic blue steel. This original old style part is a direct OEM replacement, ensuring proper fit and function for your K Frame revolver. Part: Thumb Piece and Nut (cylinder release