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Adjusting FPS on GBB

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Old August 12th, 2010, 02:06   #1
Konqurz
 
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Question Adjusting FPS on GBB

So I've been looking at lots of guns lately most of them AEG's. But then I came across the WE KAC PDW GBB (http://www.tactical-center.com/items.php?c=2&sc=3&i=170) and just instantly loved it. But it says it's rated for between 350 to 450 fps. I need it to be about 400 FPS. My question is how do I make the gun shoot a consistent 400 FPS?

It also says the gun takes Green gas/propane/CO2. Is the fps determined by the type of gas used in a GBB?

Sorry if this question is dumb, I'm new to all this. And just want to understand everything before I buy.

Thanks,
Konqurz
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Old August 12th, 2010, 02:18   #2
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there are parts which can help with stabilizing FPS, usually CO2 = higher fps
also you wont be able to get that gun without being age verified on this site, thats how it works sorry.
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Old August 12th, 2010, 02:25   #3
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Yeah, I know about the whole age verification thing. It's 10 days to my birthday . I'm just doing some research. But thanks for the info. So would green gas lower it enough to go below 400 you think? or would I have to buy other parts?
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Old August 12th, 2010, 02:28   #4
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Yeah, I know about the whole age verification thing. It's 10 days to my birthday . I'm just doing some research. But thanks for the info. So would green gas lower it enough to go below 400 you think? or would I have to buy other parts?
green gas = propane

the gas is stored in the mags

in order to run co2 you NEED A CO2 MAG!
YOU CANNOT RUN CO2 IN A PROPANE MAG!

to my knowledge most of the guns will shoot 350+ pending temperature and gas used. I know there's a part that is able to steady the variation of the fps, i cannot for the life of me remember what it is though.
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Old August 12th, 2010, 02:35   #5
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Okay thanks for the advice I'll keep all that in mind. You've been a great help.
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Old August 12th, 2010, 09:48   #6
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if you want to adjust the FPS, you might need a NPAS (Negative Pressure Adjusting System) from RA-tech (link), this will help regulate your output fps a little bit (more consistant fps for each shot) and also allow you to adjust it!
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Old August 12th, 2010, 10:53   #7
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if this is your first gun DO NOT get a GBBR. you will regret it. I have been in airsoft for over a year and paintball for 6 years, plus I am the team tech... and I am STILL having issues getting my scar working properly brand new out of the damn box.
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Old August 12th, 2010, 12:03   #8
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Okay I'll definitely keep that in mind. I was thinking of getting an AEG I just thought the GBBR's were interesting. Can you recommend a very reliable AEG, or is just any Tokyo Mauri/Classic Army good (it's my first gun btw)?
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Old August 12th, 2010, 12:12   #9
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if this is your first gun DO NOT get a GBBR. you will regret it. I have been in airsoft for over a year and paintball for 6 years, plus I am the team tech... and I am STILL having issues getting my scar working properly brand new out of the damn box.
yep... I considered getting a WE scar, but I saw some ppl use it on the field this season, and they didnt really like it... too many problems with it....

The latest WE designs are supposed to be better though.... (like the pdw, m4, m14...)

But I'm sticking with the Magna system for now...

anwyays, back on topic... aegs are more "noob" friendly.... the technology is much more advanced in terms of reliability!
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Old August 12th, 2010, 12:16   #10
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Yeah I was thinking of getting a PDW.

Would it be very hard to upgrade a stock TM AEG to 400FPS?
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Old August 12th, 2010, 12:26   #11
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Originally Posted by Konqurz View Post
Yeah I was thinking of getting a PDW.

Would it be very hard to upgrade a stock TM AEG to 400FPS?
no, just change the spring...

also, remember, the 400fps limit, is a limit... not a goal....

It's really hard to make a gun shoot a specific fps, since depends on lots of other factor then the strengh of the spring, like the airseal of the piston, hopup.... etc...

The perfect fps for airsoft, for outdoor games is around 360-380fps imo.... thats what most ppl have....
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Old August 12th, 2010, 12:41   #12
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Yeah I want it to shoot about that 360 FPS I'd be happy with. I just know that some stock TM's shoot 280 I think.

So if it is the spring and what-not that determines the FPS then what does upgrading the mechbox/gearbox do (is it rate of fire?). Sorry I have so many questions I just want to know everything I can before I buy.

Thanks for all your help.
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Old August 13th, 2010, 05:27   #13
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all tms shoot under 300fps stock as they are made for japan. Nothing over 1joul is allowed there.
to upgrade a tm to 380 do 3 things. First get rid of the nylon bushings. They tend to deform under the weight of a heavy spring. Next buy a metal bearing spring guide. The plastic tm ones like to snap. Third a spring. I personally use pdi 150% and get consistent 380 on .2 metal tech bbs.

tm honestly is just higher in quality control. Meaning you have less chance of gettin a lemon. This said they are getting out paced in todays airsoft market. Plastic bodies... Low fps... Plastic bushings.... There is now alot better out there for less money.
try ares, realsword, ca, and some other brands.
based on the rules I can't tell you were to buy these brand new... But there is now canadian retails importing guns with out clear bodies. Buying used you need to be aved and you will see even a wider range.

before you buy google the gun and read reviews on it. Don't try and be different for your first gun. Yah a uzi might be cool but find a tech that knows version 5 boxes. Something with a v2 or v3 is generally a newbie friendly gun.
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Old August 13th, 2010, 05:44   #14
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btw not saying a tm is bad by any means. Just to bring them up to par vs wha you will usually be playing against it takes a few extra things. That being said I have never had an issue upgrading a tm. They are always reliable and super easy to work on. So far I have done a tm g36 a tm ak47 a tm p90 and a basic maitenence job on a 551. All pleasures to work on.
now this g&g m16 and acm m14 on my bench have been sworn at more than a ship deck.
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