If you can find one, an old Remington Nylon 66 for accuracy. But frankly I'd just buy a plain Jane 10/22, preferably used. It should cost you $150 or so, and for that much again you can trick it out. with a new barrel etc. Or, just leave it alone. I've had mine for thirty years and never felt the need to mess with it. Though now that my eyes are getting old I am looking at a scope or optic.