Ben200987 Posted September 25, 2013 Share Posted September 25, 2013 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? Link to comment Share on other sites More sharing options...
Mike636 Posted September 25, 2013 Share Posted September 25, 2013 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? Link to comment Share on other sites More sharing options...
Suzuki Yamamoto Posted September 25, 2013 Share Posted September 25, 2013 Your 6.01 barrel might actually be too tight, a 6.03 might be a better option. Link to comment Share on other sites More sharing options...
Ben200987 Posted September 25, 2013 Author Share Posted September 25, 2013 I lubricated the outside of the bucking but not the inside? I do have Teflon tape but I was unsure where to put it? Link to comment Share on other sites More sharing options...
Mike636 Posted September 25, 2013 Share Posted September 25, 2013 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? Link to comment Share on other sites More sharing options...
Ben200987 Posted September 25, 2013 Author Share Posted September 25, 2013 Ok thanks Yes it's about 20mm shorter than the stock barrel. Link to comment Share on other sites More sharing options...
Mike636 Posted September 25, 2013 Share Posted September 25, 2013 That may be a factor too, but TBH 10 FPS isn't too much of a drama but the teflon tape mod might help bump it up. Link to comment Share on other sites More sharing options...
Ben200987 Posted September 25, 2013 Author Share Posted September 25, 2013 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. Link to comment Share on other sites More sharing options...
snowy70838 Posted September 25, 2013 Share Posted September 25, 2013 If you're using a tight bore barrel your BB choice is important. Poor quality BBs won't do you any favours. Link to comment Share on other sites More sharing options...
Ben200987 Posted September 25, 2013 Author Share Posted September 25, 2013 That's interesting, would you be able to recommend any? Link to comment Share on other sites More sharing options...
Mike636 Posted September 25, 2013 Share Posted September 25, 2013 I use ASG Blaster .25g BBs never had an issue with them, heavier ammo will also move at a slower FPS. most site limits are based on a .2g BB Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted September 25, 2013 Supporters Share Posted September 25, 2013 Did you clean the new barrel? Link to comment Share on other sites More sharing options...
ScoobySnacks Posted September 25, 2013 Share Posted September 25, 2013 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! Link to comment Share on other sites More sharing options...
Tariq Posted September 25, 2013 Share Posted September 25, 2013 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. Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted September 25, 2013 Supporters Share Posted September 25, 2013 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 Link to comment Share on other sites More sharing options...
Ben200987 Posted September 26, 2013 Author Share Posted September 26, 2013 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. Link to comment Share on other sites More sharing options...
Supporters jcheeseright Posted September 26, 2013 Supporters Share Posted September 26, 2013 clean it, it's probably still full of gunk from the factory which is why you're seeing a performance drop! Link to comment Share on other sites More sharing options...
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