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Tighter Barrel = Drop in FPS!


Ben200987
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Did you clean the new barrel?

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Could well be that the BB's you are using are actually experiencing more friction from the barrel walls. Also, that reduction in length could have a significant effect. TBH most airsoft guns I've chrono'd have had a bigger variance than 10fps anyway!

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Not really sure on the fluid dynamics of an AEG piston/barrel but;

 

For gas guns the expanding gas needs room to expand into. So getting a tighter barrel that is the same length actually gives less room for the gas to expand. Thus a lower fps.

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In a longer barrelled AEG .03mm tighter can = +30FPS

 

Also my A&K springer SVD went from somewhere around 440 with 0.2's to 438-441 (ie way too hot) with 0.3's with just a same length 6.01mm barrel upgrade and change of piston O-ring - I've had to put an M135 spring in it to get under 500FPS w/ 0.2's

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