I have looked at some of the after market bottle regs but they tend to make the bottle super long messing up the length of pull. I shoot tethered with a Huma external regulator 100% of the time from the bench anyway. I have two Humas actually. One for tuning and one for general shooting. The tuning one is a twist adjustable version so I can make on the fly adjustments dialing in my pellet weight / pressure combination to get the best group. The other reg I use you have to take it off the bottle to adjust with a screwdriver so I tent to leave that one set at a known pressure that works well for a given projectile.
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