FWIW I just got an FX barrel housing to measure so I can offer any length TJ barrel in my .22 3 groove barrel. 12"-32" will be available soon. They are full diameter hammerforged and can handle up to 30gr for sure and possibly higher. Being full diameter and no liner/housing you can truly tension without stretching the housing. I'll also be offering the TJ .30 1-26 as an FX drop in as well. Both will be using the Huma dual port thimble.
This is interesting. However a full diameter 700mm barrel would be quite substantial in weight, my 500mm full diameter TJ barrel for FX is very noticeably heavier than the FX 700mm barrel which makes the gun feels like a bench rig even with a 500mm barrel. If you can do skinnier barrel(4-8mm less diameter) and make up the difference with a tensioned carbon tube somehow then it would be really interesting. Obviously a machined and carbon wrapped barrel would put the price point well beyond most would find acceptable in airgun world.
Granted I’m hoping FX would carbon wrap their liners from the factory, I can always dream right?

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