Airguns are fun to shoot, and even more fun to modify. By their nature, airguns have far less recoil than firearms. Air rifles are powerful tools that can be dangerous or deadly if misused, but a lack of recoil means constructing a homemade stock is much simpler than a stock for a firearm. Firearm stocks must withstand a great deal of recoil, and they also must not injure the user when the gun is fired. Air rifle stocks have a much lower chance of causing injury.
Remove your existing stock. Uninstall the stock attachment screws. Various models of air rifles have screws in different locations and different methods of attaching the stock.
Cut your wood to construct the new stock. Use the jigsaw to create a stock design. The shape of your stock should conform to the body of your air rifle. Model the snug-fitting parts of your stock on the factory stock. This will ensure that your custom stock is compatible with your rifle.
Drill holes for the attachment screws. Based on the location of the screw holes in the factory stock, use a power drill to create holes of the appropriate diameter in the stock, which will allow you to use the factory screws to attach your custom stock.
Sand the wood down to remove any splinters. Use sandpaper or even a belt sander to buff the wood of the stock. You may also varnish or paint your stock.
The simplest stock designs will be for single-shot air rifles. Rifles that store BBs or pellets within the stock will prove to be a much more difficult project.
Be sure your air rifle is unloaded before performing any maintenance or modifications. Follow all universal gun safety rules.