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Low Power Bolt (CQB) Chronos 280FPS?

low power bolt cqb

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#1 lordnumberzero

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Posted 27 September 2012 - 01:12 PM

I installed the low power bolt assembly and now I'm getting FPS readings on the chrono around 280-290 FPS shooting .2g bbs and green gas.

With the original bolt, I was getting 400+FPS on .2g and green gas.

Is this correct? I was hoping to get 350FPS.

#2 akiraspeedstar

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Posted 27 September 2012 - 02:52 PM

Yup, everyone so far who's installed the new CQB seems to be shooting below 300fps. You can upgrade this by easily stretching the rocket valve spring or installing a stiffer rocket valve spring.

#3 lordnumberzero

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Posted 28 September 2012 - 07:19 AM

Just stretched the spring a little bit and now I'm getting 310-320.

THANKS FOR THE TIP!

#4 Icurblud

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Posted 23 December 2012 - 08:11 PM

What spring did you stretch?  I just bought the Mp7 and need to get to that 350 range.   Is this spring in the bolt?  Could you just cut the original spring down that is in the original bolt if that is where the spring is held.

#5 gcw360

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Posted 24 December 2012 - 06:59 AM

View PostIcurblud, on 23 December 2012 - 08:11 PM, said:

What spring did you stretch?  I just bought the Mp7 and need to get to that 350 range.   Is this spring in the bolt?  Could you just cut the original spring down that is in the original bolt if that is where the spring is held.
The srinp is inside the cylinder and regulats the rocket/flute valve.  By stretching it you will increase the FPS.

In the attached parts digram, see here: http://kwausa.com/fi.../CR_S08_MP7.jpg

The spring is part #28 and the rocket valve is part #27

Hope this helps.

#6 Icurblud

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Posted 24 December 2012 - 10:34 AM

Ok.  So if i add the low power  bolt and want to get a little more fps i can stretch that spring a little. Do they sell different weight springs?  Seems like that would be the best way just like in an AEG to just change that spring to achieve a different fps. What about this NPAS valve that is adjustable.  I watched a utube video on this valve and he was able to adjust it from 360-200 fps i believe.  It adjusts by going through the barrel with a long adjuster.



Edited by Icurblud, 24 December 2012 - 11:14 AM.






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