Quote Originally Posted by Dornfelderliebe View Post
It's common to remove the buffer washer on a Mercury/airsporter but then you have to drill a new hole for the retaining pin and probably shorten the spigot. I cannot see how you can remove the buffer washer on a key way head on the Meteor without making so much play that it rattles about on the piston.
Some aftermarket heads are fixed with a nut where you probably, can remove the washer, with the benefits above.
We make a version that takes the original O-ring and buffer washer on a nut for the Meteors

https://www.airgunspares.com/162194j...onheadjki.html