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I use KM high flow valves and only recommend them. I've used so many different ones, tested them all and the KM high flows came out with the best balance of highest and most consistent velocities. Other valves may have an extremely high first 3 shots, but the rest of the shots dropped lower and lower due to excessive output. Some valves just plain didn't work at all. Nine Ball ones come to mine... they're garbage.
I use Guarder hammer springs in most of my setups.
Mass of knockers hasn't seemed to have been any issue, as long as it's lubed well and moves freely when the hammer strikes it. I only recommend steel knockers anyways, because aluminum is too soft and prone to wear when taking the brunt of a steel hammer with the full weight of a 150% hammer spring behind it smashing it against a steel high flow valve under the pressure of propane.
For fast follow up shots (double tap), a smooth, short and light pulling trigger helps extremely. Trigger work like this includes the trigger, the stirrup, the sear, and the hammer. I think my current setup is a bit precarious though, as Tys has even mentioned that the hammer feels "creepy". I don't think I could tune the pull to be any lighter between the sear and hammer.
Combined with a load of shock buffers, my current setup is extremely fast. Even Lanny "Lightning" Nguyen has approached me after a match and asked me how he can make his setup doubletap that fast.
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