good morning

This has some info and one guy uses autosol. Also has how long a leather piston takes to break in which is a bit of a shocker.
http://www.airgunbbs.com/showthread.php?856076-Polishing-the-Compression-Chamber-Efficacy

Sorry I read it wrong, thought you were going to polish the barrel! That's what I've seen FX do.

Polishing the piston chamber, yes I've used a dowel with emery paper, also used a very fine steel wool on the end of a extension bit on a drill (steel wool bits goes everywhere with this method)

Am intending to use the old military trick of swabbing the "polished are a with boiling water vinegar-heat will dry metal and that should remove any residues.autosol is very fine -we used it in my Tfarmy days to remove crap and plastic sh*t off SLR gasplugs after using blank ammo or prolonged sessions on range.

The level of polish is an interesting subject. I could see a high mirror shine actually increasing drag and heat, clearing the surface lubricant quicker. (speculation have not looked into it to deep)
Where as the wet dry would leave tiny scratches that the lube would fill.
If the seal actually pushes into them this would in theory actually create a larger surface contact area.
What is general difference you guys who are pulling rifles apart all the time, have seen between the brands?
Have any of you seen a mirror finish stock in a cylinder or is it usually just a high shine (if that)

@nunga so how far would you go when touching up a cylinder. I. E light deburring, slight polish, leave alone etc. Would this vary from cheaper to top quality models?