NPAS Screw looseness?

slink182 · April 16th, 2012, 12:46

I'm currently fiddling with a RA-TECH NPAS valve in a WE 39C. I've noticed that it turns very freely - that is, I insert the reverse allen key, and the valve screw turns with very little (VERY little) resistance. I would've expected the screw would be more resistant to turning, to minimize the chance of the valve shifting more open/closed.

Is this looseness normal? Should there be something else in there to provide friction?

Thanks in advance.

z0ng · April 16th, 2012, 13:09

Usually there is a spring that puts pressure upon the adjustable portion of the valve keeping it in place. I remember it being fairly easy to adjust back when using mine.

I would say try test firing it a bunch with a chronograph and see if there is any obvious shift in FPS from the valve moving. You could also carefully mark it to see if it is turning between test firing sessions.

Gunny_McSmith · April 17th, 2012, 03:39

Yep, its a common problem with the NPAS... back when i had one in both my WA m4 and my KSC mp7, I would adjust the fps, and a couple of shots later, the fps would have changed to another one.... :S

To fix this you could either adjust it to the fps you want, and loctite it, or put some teflon tape on the threads....

slink182 · April 17th, 2012, 06:45

Thanks, Gunny. After pulling the NPAS, there wasn't a tension spring inside, so the teflon tape is a perfect solution.

Thanks all!

Lt. Zicari · December 14th, 2013, 12:02

I know this is an old thread but watching all of these videos where you can adjust the valve while in the gun is kind of bullshit for me... As it sits in there loose, when you turn it to tighten it, the whole valve spins... this is really frustrating as I don't want to have to completely disassemble the gun every time to adjust it. Is there any fix for this??

Jamroxorz · December 14th, 2013, 12:43

Take a small Alan key or screwdriver and hold the valve in place while you adjust it with the NPAS key. That's how you do it.

Kos-Mos · December 14th, 2013, 14:37

Quote:

Originally Posted by Jamroxorz

Take a small Alan key or screwdriver and hold the valve in place while you adjust it with the NPAS key. That's how you do it.

This.

I also found that after a few mags, the valve gets tighter as the o-rings on the screw dry up.

I would have to take the nozzle apart to re-adjust it now.

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April 16th, 2012, 13:09	#2
z0ng Trader rating Join Date: Jul 2006 Location: Hamilton, ON	Usually there is a spring that puts pressure upon the adjustable portion of the valve keeping it in place. I remember it being fairly easy to adjust back when using mine. I would say try test firing it a bunch with a chronograph and see if there is any obvious shift in FPS from the valve moving. You could also carefully mark it to see if it is turning between test firing sessions. __________________ Team GHOSTS G-42 How to fix your WE M4 Mags

April 17th, 2012, 03:39	#3
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	Yep, its a common problem with the NPAS... back when i had one in both my WA m4 and my KSC mp7, I would adjust the fps, and a couple of shots later, the fps would have changed to another one.... :S To fix this you could either adjust it to the fps you want, and loctite it, or put some teflon tape on the threads.... __________________

December 14th, 2013, 12:02	#5
Lt. Zicari Trader rating Join Date: Sep 2006 Location: Oshawa, Ontario	I know this is an old thread but watching all of these videos where you can adjust the valve while in the gun is kind of bullshit for me... As it sits in there loose, when you turn it to tighten it, the whole valve spins... this is really frustrating as I don't want to have to completely disassemble the gun every time to adjust it. Is there any fix for this??

December 14th, 2013, 12:43	#6
Jamroxorz Jamroz Trader rating Join Date: Aug 2011 Location: Brampton Ontario	Take a small Alan key or screwdriver and hold the valve in place while you adjust it with the NPAS key. That's how you do it.

NPAS Screw looseness?

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