i am a keen clay pigeon shooter and i would have to say that clays are not biodegradable so if you manage to buy a trap i would advise you to fire it over a waste bit of land. i wouldnt no ware to go to buy one but i bought a electric one second hand it was but works a treat runs of a car batterie so iam very happy that i paid half the price and got a trap that is just as good as new. good luck Happy buying.