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Originally Posted by SHÖCK
Depends on the gun. An NPAS on a GBBR can tune the FPS. Changing the hammer spring or flow valve on a GBB can also tune the FPS.
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I was referring to an external adjustment to easily tune the gun. But I believe the part that you left out of my quote covered that for GBB...
Quote:
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The only way to tune AEGs is by swapping springs, which requires a complete teardown of the gun and its mechbox. Pistols can usually have minor velocity changes made with replacing some internals, but the velocity changes are minimal.
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And by minimal in GBB, I mean you can change the velocity by 10-15% (usually upward) with the installation of aftermarket internals.
GBBR usually require some pretty extensive mods / aftermarket parts out of the box to allow that. Can be done, but at substanial cost
And I guess I should add that some guns do have external HPA / CO2 rigs and they can be adjusted, but those are the exception rather than the norm.