Quote Originally Posted by harvey_s View Post
Interesting, fitting a TR Robb PTFE head in mine gave an instant 25 fps boost.

If you've sanded yours - then that must of made it smaller, so the gain must be coming from the oil swelling which is likely to wear off - possibly fairly quickly.
It would be interesting to see how it's doing after say 500 shots...
I actually can see the PTFE benefit, but not in my gun with its bumpy cylinder LOL

When I said sanded, i actualy just "broke" the impacted surface enough to allow oil to penetrate as it was solid, impacted and shiny before..

I have gone back to the leather and after about 300 shoots is now shooting 360+fps with single figure consistancy.