Spring choice for V2.5 gearbox

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snowy70838

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I have modified a G&G SR25 to take a version 2.5 gearbox.

Does anyone have experience with spring choice for these gearboxes? I am after 400 to 425fps.

The barrel is a 509 x 6.03mm madbull.

Thanks

 
There is a list on airsoft sniper forum, under long range AEG section ;)

 
G&G SR25's come fitted with a standard version 2 gearbox. I modified mine to take a version 2.5. After the effort involved in getting it to fit I wouldn't do it again.

The version 2.5 is just a longer version 2. The extra length being the longer piston and cylinder.

Take a look here....

http://forums.6mmdistrict.com/showthread.php?tid=1980

 
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just out of interest has the gearbox made a massive difference?

 
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Yes. The range has increased dramatically and it is only pushing out at 360fps at the moment. Using 0.36bb

I should say it's pushing out 360fps using 0.2g bbs but i actually use 0.36g bbs for test shooting.

 
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I don't see how the type if gearbox has any relevance in increasing the range. That's all to do with the power, hop and barrel.

 
It is something to do with the cylinder to barrel volume ratio being better for long barrels. As the V2.5 has a longer cylinder/piston than a V2.

I dont understand this myself but all i can say is it works.

 
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