I have had 3 of these guns and done several tune ups, and never was disappointed. I bought the maccari grease kit. comes with the moly blend, heavy tar and grease. if you are patient, have some assortment of emery cloth and some basic tools you can do it. although I did stab myself with a screwdriver while trying to install a spring my first go at it
so don't use a screwdriver. they are bad for the health. never had any real luck with scopes but with open sights its a great off hand shooter. tuned for power or not.