Take it to an authorized repair center or a qualified gun smith.
yes
To replace the firing pin in a Smith & Wesson Model 39-2, first ensure the firearm is unloaded and disassemble it according to the manufacturer’s instructions. Remove the slide and locate the firing pin, which is typically secured by a retaining pin or a spring. Carefully remove the old firing pin and replace it with the new one, ensuring it is properly seated and secured. Finally, reassemble the firearm and perform a function check to ensure everything operates correctly.
Smith and Wesson Model No. 2
Take it to a gunsmith
Best left to a trained and equipped gunsmith.
The frame size of a Smith and Wesson model 66 is K.
No such model listed in the Standard Catalog of Smith and Wesson. You will need to call the factory.
Smith&Wesson model 14
The Smith and Wesson model 19-5 was made from 1982-1985.
The smith and wesson model 18-3 was made from 1967-1976.
Standard catalog of Smith and Wesson by supica and nahas
The Smith and Wesson model 915 was made from 1992-1994.