Interesting, fitting a TR Robb PTFE head in mine gave an instant 25 fps boost.Originally Posted by hellsquad
3 After fitting a mr robb PTFE piston washer = shit LOL all felt nice but fps = 320fps even after bedding in. !! Cause on inspection was clear, LP53 cylinder bore is not very true. Looking down the inside the were witness marks made over time where the casting of the handle part swelled the chamber a tad during casting/cooling and the piston had rubbed, anyway PTFE is hard and needs a perfect bore, this LP53 does not have that
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...
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