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I note that TM has changed the oring in the piston to a "V" ring type seal. It's like an oring with a V shaped cross section. The open portion of the V points forward into the nozzle body.
Nice choice. When pressurized, the V cross section inflates and seals to the nozzle body. When depressurized it shrinks again and applies no sliding friction when the slide goes forward into battery. Harder to find replacements though.
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