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First, when chronoing your VSR10 with 0.2gm, you are chronoing it with the hopup off. This will give you lower than normal fps. The VSR is different to most AEG's that it will gain fps with the more hop you applied. So most people chrono it with 0.2gm but with the hopup set to shoot the heavy bb's nice and straight.


You are getting 2.19 joules on 0.36gm and a 300mm inner barrel (Hopup set for 0.36gm bb's). So a short barrel. 2.19 joules is the equivalent to 489fps on 0.2gm. With a new AA M150 spring and the correct cylinder to barrel ratio (A 500mm barrel for 0.36gm) for I would I would expect about 500-510fps. This would then drop back once the spring is worn it to about 490fps.


If you do have an air leak, it is the major reason as to why you have lower fps. It is the length of your barrel. You should try a 500mm or a 470mm x 6.01. The 470mm inner barrel will allow you to use both 0.4gm bb's and 0.36gm bb's to high effect.
 

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Agreed with ArkAngel. Though I would get rid of the 300mm barrel as you have so much waist air since you are using 0.36gm or 0.4gm bb's.

Here is a chart that may help you as to what inner barrel goes with what bb weight.
0.3gm bb use a 554mm barrel (15821 mm^3) = 2.26:1
0.32gm bb use a 530mm barrel (15136 mm^3) = 2.36:1
0.36gm bb use a 500mm barrel (14279 mm^3) = 2.51:1
0.4gm bb use a 470mm barrel (13422 mm^3) = 2.67:1
0.43gm bb use a 430mm barrel (12279 mm^3) = 2.92:1
0.45gm bb use a 400mm Barrel (11423 mm^3) = 3.13:1
This will get you the most efficiency out of your system.
 
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