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Discussion Starter #1 (Edited)
I just turned my M4 into a major CQB weapon by adding this CQB kit and i think i want to make it CQB to midrange. http://www.airsoftextreme.com/store...oduct_info&cPath=407_420_423&products_id=3056

Now i feel i can benifit from a upgraded spring, since my gun is only shooting at 270fps. I was wondering, what were the side effects of upgrading the spring. Im pretty sure i want to go to 400fps and should i get new gears too ? I have G&G internals, so im not sure whats going to happen, and im wondering what you guys think.
 

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Well when you upgrade a spring, you need to upgrade realted items for reliabilty as well.

AEX's upgrade sections will give you a list of what is recomended on top of just the spring. (It's nice AEX is so honest listing everything).

http://www.airsoftextreme.com/store/index.php?main_page=index&cPath=481_489

Notice, minimum they suggest a spring and bushing be upgraded. But on CA's replacing the polycarb piston is a good gthing to do (CA didn't use the best materials in their pistons). I've always have AEX install their "Extreme Durabilty" upgrades on my AEG's.

What mfg M4 did you put the DPMS front end on? CA and TM have strong gearsets, so they really only have to be upgraded if over 400fps (M120 spring or higher). All the AEX upgrade prices include installation, but if you want to try the install on your own, this video will help:

http://www.mechbox.com/site/mechbox-upgrades/version-2-mechbox-upgrade-video.html
 

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Discussion Starter #3
I put it on my G&G GR16, but my question is what does the spring do to the RoF, and also, how do highspeed gears make my gun have a higher RoF as apposed to normal metal gears.
 

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The spring has NOTHING to do with rate of fire. Battery voltage and/or upgraded motor and/or high speed gearset will effect ROF.

You'll notice on a high speed gearset is like a 10 speed bike. While you pedal 1 revolution depending on which gear you are in rotates the wheel more or less during same pedal rotation. The trade off is it add's more stress on your motor. Simple way to put it is the highspeed gearset will push you piston back on the spring in less motor revolutions then a normal gearset.

this animation may help you make sense of it:

http://www.mechbox.com/site/mechbox/the-mechbox/how-the-mechbox-works.html
 

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Discussion Starter #5
so in your opinion, would i need to buy new gears, or can i just get the standard upgrade and still be ok ?
 

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Discussion Starter #7
I'm thinking of putting in the M120, but i think ill just go with the standard upgrade. I think my gears can take the ware and tare.
 
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