Pellet probe experiment.

[Millingman]

That's an o ring setup on my Rotex Rm8 maybe that's what your trying to achieve.
My FX Dreamline has an o ring inside the brass breach for the probe to seal.

[Squinty]

I think he meant a groove & O ring where the outer probe seals on the barrel breach, not to seal the inner probe.

yeah.. crossed my mind after i posted

That's an o ring setup on my Rotex Rm8 maybe that's what your trying to achieve.
My FX Dreamline has an o ring inside the brass breach for the probe to seal.

like many the probe is also the air feed and goes further into the breech, the Rapid would be limited by the relatively short travel.

[KevG]

never had a problem with the standard theoben or dr bobs probes my self
kevG

[PiL]

I've got a peek probe on my .177 mk1. Dave from Doncaster who used to be on the old forum made it for me about 8 years ago and it's still going strong 👍

[Joonoz]

there you go..  just a quick trial on a bent outer.
Not a full groove in the face of the outer, imo it would need a 1mm o-ring supported on both sides.
O-ring sits on the inner under the spring, compresses into a radius.


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When using PEEK on valves or pellet probes, if the hole is drilled to the correct size then the peek seals itself against the inner superbly. No orings etc required.