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I would avoid the RA-Tech NPAS and get a Cradle Velocity reducer instead. The NPAS will creep/close, increasing the FPS. Even with teflon tape on the threads, or locktite, it will still work its way closed.
I have a cradle in my KC and it has zero chance of adjusting itself mid game. It is a minor annoyance to change the FPS, but it's worth it. It also seems to be more consistent than the NPAS from my experience.
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