I'm a time served machinist/toolmaker by trade, this sort of thing doesn't faze me, don't worry! I understand the principle of them I just want to know whether they're a worthwhile improvement and if prior work to the piston is done, in general.
Thanks for going to the effort of putting all the pics up. The piston is pushed upward by the cocking arm so the 12 o'clock area will see the most wear, they always show that when you take a piston out (of a break barrel anyway as someone else has said).
Is anyone familiar with PEEK? I think it'd be my first choice for material. I've used it with great success in the past in many applications where low friction & good wear characteristics are required. It's not cheap stuff if you were to buy it but I've got quite lot that I've saved.
I might give it a whirl when I get chance. I rely on using friend's machine shops nowadays for doing bits like this, the only engineering I do now in my day job is on a screen
Cheers
Greg
Never heard of but googled. Looks interesting.
https://en.wikipedia.org/wiki/Polyether_ether_ketone