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PTFE piston seals The P1 piston seals are made from polytetrafluoroethylene or PTFE, of which Teflon is one well-known brand. That material is low friction and takes the shape of the compression chamber. In fact, the break-in procedure for a new P1 piston seal is to dry-fire the gun a couple times on high power. That squashes the seal out until it fills the compression chamber perfectly. I was given that procedure from Don Walker who used to work at Beeman as their maintenance tech.
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