NB179F Smith & Wesson N Frame Model 27 Thumb Piece & Nut .357 Magnum j637u This cross-compatibility is due to

This cross-compatibility is due to similar cylinder pin designs across these specific models

This center pin is designed specifically for J Frame models with 3" barrels

This listing is for the extractor rod only

or owners performing restoration or repair work on Model 500 revolvers

NB179F Smith & Wesson N Frame Model 27 Thumb Piece & Nut .357 Magnum j637u This cross-compatibility is due toNB179F Smith & Wesson N Frame Model 27 Thumb Piece & Nut . 357 Magnum How to determine the model number of your Smith & Wesson Revolver. Swing out the cylinder , check behind the yoke on the frame for a MODEL NUMBER. Model numbers began in 1957 58. So if there is no model number then your revolver may be older than 1957 58. In this case we can possibly still find the part you need with the serial # . If this is the case contact us and we will need a