It depends on the model. Do a search on the web for "Air gun Repair" or see the link below,
check this one out
cutt.ly/qkjBJJy
NON NON spares forFlorabest
Only if the airgun has a scope rail designed into the gun. You will also need an airgun scope not a firearms scope.
One can purchase Tricity Bendix genuine spare parts for various appliances from retailers such as Tricity Bendix Spares, Electrolux, eSpares, Buy Spares and Partmaster.
AnswereBay is a good place to look.
Auto parts and repairs
Auto Electrical Spares specializes in vintage and classic cars. They are one of the very few places you can buy the parts you need for repairing the vehicles.
pug shop? on in lye stourbridge and darlaston by me in the west mids
mandatory spares
emergency spares ordinary spares that are easy to get
If your in the United States, then I would check with "Craigslist" or "Guns America" on the web.
A Chevrolet spares dealer.
The highest velocity of an airgun is that of Evanix AR6 pistol which is 1000 fps.