After years of looking, one of my "grails" finally showed up, an Anschutz 335 magnum.
It seems well built, better than most in my opinion, but the action is a bit harsh, and it only does about 650fps with lightweight Geco/Rws wadcutters. The spring seems like it is quite good, and there is not much shooting wear on the gun. I have of course cleaned it out, and changed the piston head with nails and matchheads for one in better condition from an old diana35.

I would like to soup it up a bit, has anyone tried to convert to modern synthetic seals? A transfer port reducing sleeve might be needed?
The gun seems to have plenty of stroke/volume to make good power.