Dual Caliber Quick Change Setupe:
For a short time I had two Leshiy 2s because I wanted a low power .22 and high power .30 setup. But the reg and nozzles used different settings. Also discovered the larger plenum will definitely give a 10fpe boost on a .30/450mm setup. Just makes it annoying enough switching back and forth that two guns made sense in every way except financially as there was additional cost for second scope and mounts and accessories for the rail, etc. So I sold my second Leshiy 2 and went a different route to reduce cost.
I now have 2 barrels and two simple to swap valve setups. The high power setup is using the stock reg set at 160 bar with 0.2mm/0.3mm nozzles and the larger plenum. The lower power .22 setup has a Huma reg, 0.3mm/0.8mm nozzles and a standard plenum.
Swapping calibers is now as easy as drain air from tank, swap barrels while air is bleeding, swap reg/plenum/valve setup and refill. Longest part of the whole process is draining the air.
man I really like this Leshiy 2 but I keep throwing money at it. I have as you know the .30 x 350mm and the .22 x 250mm and have worked up my favorite tunes on both similar to you, but just have kept it with the .30 this summer as I have my new Dreamline .22 now that shoots the Hades really good at 930 FPS! My Leshiy doesn’t like Hades in .22 or .30 but does OK with the H&N hunter and barracudas and FX Hybrids. I do want to change the Leshiy to the .22 come this fall squirrel season as in PA you can not hunt squirrels with anything over .22 and I prefer the Leshiy for hunting / stalking . I really like your system of an extra valve/reg set up for a quick change but I only see me changing it once a year, so..... I’ll hold off spending any more on it for now. For what it’s worth my high first shot problem isn’t a problem since I took the reg apart and polished the washers with 3000 grit paper on a piece of glass and lubed and reassembled. I tested with the tester and it held the same pressure over night . I even fired it a few times and retested and it held the pressure. Does anyone know if Brian has those regulator stickers Ed showed in his video?