This is one that I bought from the original buyer. I still have the Composite stock for it. It's made of some combination of materials to make it impervious to the elements. I thought it might look better in this JM Walnut finished by Scott Blair of Airguntunes.com.
This .20 caliber carbine is powered by a gas piston. It was a special option offered back then. It still shoots lights out after over 30 years of use.