Vintage Airsoft, which have their online store on Etsy, have replacement shells that owners of the airsoft Webley Pistol can purchase from them. These are made to order so it will take time for them to ship your order... "At Vintage Airsoft, we love the Wingun Welbey MkVI. We have a couple of products here to make it more usable for airsoft skirmishing.

You can purchase the original gun from any good retailer."