Best fitting fill probe with QC Connector Hatsan

Not a fan of the threaded end fill probe that comes with the Hatsan Blitz. I want one that looks like this made of steel, not brass that I plan to leave in the gun with a cap on it.

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From looking at the Hatsan website, it appears that all Hatsan airguns with fill probes use the same sized probe. If you have a probe like the one above that fits your Hatsan well and doesn't fall out when not under pressure, please post a link. Thanks!