For one that looks in that condition I think you did quite well. Shooting that well I don't think I would do anything but oil it. Just watch that foam wiper, if it looks to be deteriorating I would replace it. I have seen were people got actual foam replacements, made a ring out of a piece of felt. or like the reseal kits I got for mine a couple of years ago a set of I think 5 split teflon rings, split somewhat like the rings in a car engine so they can expand a bit to slip over the larger part and into the groove. With that many there are several spaces inbetwee that holds a reservoir of oil to keep the piston lubed.Sure, I paid $365 shipped. No regrets!
I purchased a reseal kit for it before the pistol arrived, knowing how these things can go with 40 yo airguns.
After test shooting this one over the chrony for a few shots, I never bothered to open the kit!
Shooting JSB 7.3 @ 387fps.
I have to pinch myself, to be sure this lucky find is real.
Have fun.
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