you are a lucky dog - these rifles are terrific!
have had mine for a looooong time - it "ain't" a magnum, but it is a LOT of fun to shoot!
if you haven't done so yet, take it to a reputable airgun smith to have it completely taken down, cleaned and lubricated - correctly.
really, you don't need to have this done more than once in a decade, but if you have no idea as to it's maintenance record - this is probably a good step to ensure continued long life.
have fun with a real heirloom!