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Inner barrel length + cylinder volume questions


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Old October 15th, 2014, 06:16   #1
Join Date: Aug 2014
Location: Toronto
Inner barrel length + cylinder volume questions

Hi guys I'm fairly new here with minimal knowledge on gearbox and internal but I decided to take a leap and try to upgrade my AEG internally. So here it is:

First question is
Would a modify (300-450mm) cylinder would be enough to propel bb down a madbull 6.03 455mm inner barrel?

2nd question is
What spring should I use to to get as close to 390-400fps assuming perfect world minimum airleak?

Any other precautions I should take note when building with this set up. All reference items are found at As you can see I'm not age verified yet.
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Old October 15th, 2014, 12:57   #2
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ThunderCactus's Avatar
Join Date: Feb 2007
You always want to be on the minimum side of the cylinder. Heavier ammo will need more air volume than the .20s they test cylinders with.
And a 120 spring will get you closest and potentially just a bit over 400.
You can add or lose 5-15fps by adding or removing the bearings on the spring guide and behind the piston head
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