Skout Everything Skout EVO and Epoch

It came down to a issue or at least concern of maintaining the incoming air from bottle at a semi consistent pressure so the on-board regs in turn showed less deviation in pressure .... A very neurotic pursuit of looking for any little bit of a tighter ES value.
* We know how that turned out for FX, having many remove one.
*** Tho do understand the LP reg is ONLY for feeding the solenoid that unbalances the spool valve opening it So in reality for the actual air used to propel the projectile there is only one regulator in stock configuration.

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MSR Workshop said:

So yes, I get them especially on guns that don’t use 4500 psi like a 10 m guns. I appear to using this because I want to be able to fill your spare tank to 4500 but say you’re gonna only take 2000 this is a way to regulate the air coming into your tank..

What I’m talking about is one between the on board bottle and the gun, regulating out going air pressure before it ever hits the high-pressure regulator.
trying to understand why this would be beneficial and why some people are using it.

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Aside from the FX there are a few guns with two regs, the idea being to give the main reg an easier time of it and helping to keep any creep to a minimum, I actually have a spare Lane bottle reg that I might at some time try and see if it makes any difference, but I suspect I will need an adapter or two to fit it,
As the Epoch HP reg is fully adjustable both up and down under load I am not sure just how much it will benefit but maybe worth a try, but as I got a 150 shot string with an ES of 14 and an average of 2.5 at the range yesterday I am in a hurry just yet, add to that I am now seeing a full mag for only 10bar air consumption I think that pretty dam good.

You can get FX adapters so you can use an FX quick detachable bottle valve, and the Lane reg allows you to fill the bottle before the reg.