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My tac one has a ULT and X-valve. At 850 psi, I can get it to RT an entire hopper if I want at around 12 or 13ish bps.
It's also walkable, and only RT's when I want it to. I've got about 2 and a half shims in it. I sanded one down until my mag behaved exactly like I wanted it to.
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