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Ben200987

Tighter Barrel = Drop in FPS!

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I've recently changed the barrel in my G&G G26 from stock to a Madbull 6.01 229mm barrel and my FPS has done the opposite to what I had hoped. It's dropped by 10fps. Can anyone shed some light on this for me please?

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It may just be the airseal around your hop up rubber isnt as tight as it was before, try a bit of teflon plumbers tape to try improve it and did you lube up your hop up rubber before you put it on your new barrel?

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Your 6.01 barrel might actually be too tight, a 6.03 might be a better option.

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I lubricated the outside of the bucking but not the inside? I do have Teflon tape but I was unsure where to put it?

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If you put teflon tape around where the barrel leaves the hop up unit that should improve your airseal. Is the new barrel a different length to your old one?

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Ok cheers for the info. I suppose I was just expecting to see an increase in the fps that's why I'm disappointed but I will try some tape this evening.

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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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Did you clean the new barrel?

No I didn't clean the new barrel. I've ordered some ASG blaster bbs because apparently they are more consistent in size so should be better for tight barrel.

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