It's going to take some searching. I would contact several of the places that I have listed on the link below. Or do a search for "air gun parts" on the web
Take it to a gunsmith
GunBroker.com
it is a Model 39-2 9mm pistol
300-700 USD
Give you $20 for them. Thanks, Atson
Smith&Wesson model 14
Smith and Wesson 6909 Stainless steel semi-auto pistol stopped produvtion in 2001
A fine pistol.
Smith and Wesson 9mm Model 39-2 Chrome finish.
CHeck with the maker of the grip.
Need a sn to date it.
No such model number.