I haven't tried to install it yet but this may help you to understand how it works and adjust your modify.
http://m.youtube.com/#/watch?v=I93HqminCF0
Look for : ra tech how the npas works
Quote:
Originally Posted by BlackBerry
Hey guys, how much of the nozzle did you all shave off when installing the NPAS?
I shaved off as much as I removed when I cut the two tabs off, but for some reason I can't get it to shoot under 350 with .25's.
It's constantly hitting an average of about 370fps with closed up NPAS and average 400fps with slightly opened up NPAS.
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