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The only adjustable output regs I'd look at are the Mac Dev and the Stupid Parts Max-Flow. Both of these are consistent enough to take the job of the inline reg, so you could use a gas-through grip in place of the inline reg and cut a bit of weight. I still don't think it is worth it, because swap-ability in the pit is more valuable to me than cutting a few onces from gross gun weight.
It is usually easier to swap presets between guns than adjustable output tanks. The asa threading on preset tanks means you unscrew it from one and attach it to another. Easier for tearing down gear at the end of the day, as well.
The only adjustable output regs I'd look at are the Mac Dev and the Stupid Parts Max-Flow. Both of these are consistent enough to take the job of the inline reg, so you could use a gas-through grip in place of the inline reg and cut a bit of weight. I still don't think it is worth it, because swap-ability in the pit is more valuable to me than cutting a few onces from gross gun weight.