Going back to the original (2+ year old!) question and Stevoo's response above - the P1 / HW 45's piston seal is a solid chunk of PTFE, not a "parachute" seal with a thin edge as in many springers. The instructions actually recommend dry-firing a new gun once or twice to help size the seal to the cylinder.
This also works with the classic Webley Hurricane and Tempest.
This also works with the classic Webley Hurricane and Tempest.
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