Take it to a gunsmith.
plenty
200
want ad, gun show, gun shop
50-200
Daisy has a web page to help you determine the value of old BB guns. See the link below.
100-1000 USD or so
See: http://www.gun-data.com/tour7.html this may help you.
Gun Parts Corp or Jack First websites
Blue Book of Gun Values
20-60 USD or so
I happen to have the same rifle. I have been looking for worth and owners manuals for the gun and the only info i can find on the gun is it was made in 1983.
Why would you want to, get another gun, it is a very weak gun, buy the pulse R76 or just send the gun in with your warranty.