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 Perfect CQB gun?

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PJ-Lero

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Posts : 268
Join date : 2010-01-24
Age : 26
Location : PSJ

PostSubject: Perfect CQB gun?   Sat Jun 05, 2010 1:43 am

i think so Very Happy
Finished installing all the new parts;
Modify Version 2 Anti-Reversal Latch with latch and flat head screw

King Arms Ultra High Speed Gears- "Ultra high speed gear set with 13:1 ratio Constructed to be very quiet. "

G&P M120 Short Motor

CA Reinforced Piston with Full Metal Teeth

Modify S100+ Spring


with some good ol Mad bull grease and CA shims with a 11.1v 2200 25c lipo shooting good 300-320 fps at 30rps =D
This is on my FN2000, so its as compact as a M4 stubby, but with a longer inner barrel, and the bullpup design makes changing mags in a pinch easy.

i will post pics and a vid as soon as i can get ahold of a camera.... LOL
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FA-Chris M
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Join date : 2009-11-06
Age : 36
Location : Saint Cloud

PostSubject: Re: Perfect CQB gun?   Sat Jun 05, 2010 12:53 pm

That FPS seems sort of low and the ROF seems REALLY low for all that's in it.

I was getting 33 a second with stock gears at 380 FPS before with the same motor and battery nearly the same as yours. Could you shimming be too tight? Maybe the bushing holes?

What did you use to measure the ROF? I use a program on my computer called "Audacity" (it's free) and a mic placed at the end of the barrel or next to the gearbox to either capture the air bursts or the piston sound.
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PJ-Lero

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PostSubject: Re: Perfect CQB gun?   Sat Jun 05, 2010 9:13 pm

thats what i figured too, im using a chrono lol
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FA-Chris M
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Age : 36
Location : Saint Cloud

PostSubject: Re: Perfect CQB gun?   Sun Jun 06, 2010 1:18 am

Which day are you going this weekend or will you be there for both?

We'll have to get together and see if we can figure out (verbally) where the problem may be.

Oh wait... I'm using one of my mosfets!

THAT may make a WORLD of difference. An average of a 20-30% increase in ROF... That could be it right there!

Let me know if you want one.

The low FPS is still strange since the gun was shooting like 370's with the stock spring. Did you change the bucking?

Are you lubing the bucking before you slide the barrel in place? If not, the bucking may be getting shifted and an air leak may be occurring.


Last edited by Fireman on Sun Jun 06, 2010 10:00 am; edited 2 times in total
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SHWELL
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Age : 41
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PostSubject: Re: Perfect CQB gun?   Sun Jun 06, 2010 9:38 am

With that s100 he is in the right FPS range... well maybe closer to 440.... ROF is spot on without a Fet... My M4 was 32 without and 35 with FireFET.. Same Sring rating and Motor combo... Lipo is values are the same as well for that ROF...

Good Work Lero... still think the size of the FN2000 is a little bulky to be the "Perfetct CQB", I still give my vote tothe P90 design.
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