sniperslucky Posted May 31, 2016 Posted May 31, 2016 Hi All, What impact does the inner diameter have on FPS 6.01-6.03, i have heard that the bigger the bore the more FPS reached ifso how would the FPS react to a 7.10 inner bore????
Supporters Sitting Duck Posted May 31, 2016 Supporters Posted May 31, 2016 7.10 bore ??? that would be like going last at some Vegas brothel at closing time tighter bores generally increase fps a little - 10% ish but tbh some stock barrels are quite good vs a poor tbb that often this may not always be the case wider bores you generally will lose a bit of fps around the bb
Hef Legend Posted May 31, 2016 Posted May 31, 2016 Duck is right. From experience going from a stock 6.08 barrel down to a 6.02/3 usually results in about 10% depending on length too. Widebore barrels reduces fps as the pressure behind the BB is less as the air has more area to flow past. Depending on set up, one may or may not provide you with other benefits such as range/accuracy. Also worth considering quality of the bore, a shite 6.01 will perform worse than a polished 6.08
sniperslucky Posted May 31, 2016 Author Posted May 31, 2016 7.10 bore ??? that would be like going last at some Vegas brothel at closing time tighter bores generally increase fps a little - 10% ish but tbh some stock barrels are quite good vs a poor tbb that often this may not always be the case wider bores you generally will lose a bit of fps around the bb call me blind , but i could not see any reference to barrel sizes in those two links ???????????
sniperslucky Posted May 31, 2016 Author Posted May 31, 2016 I was searching the internet for suppliers of brass tubing, as most are priced better as they post them for hobby making rather than paying over the odds for a brass barrel from a retailer. But i couldn't get a tight bore under 7.10mm!! .As yet again the company i brought the gun from lied about the FPS. Also barrel length was 550mm due to adding a fake flash hider.
Root Admin proffrink Posted May 31, 2016 Root Admin Posted May 31, 2016 Surface finish matters more on barrels than bore diameter. Please search for this though - there must be 100 threads on it on here alone. Barrels are one of the most talked about things in airsoft, so do the legwork. Go PDI or EdGI if you can afford it. If not then LayLax/Prometheus. I mean you could buy your own brass, but you'd need to polish it very well, you'd need to crown it and you'll need to cut the window in it.; after all that it's just not worth it. Unless you have access to a CNC mill the amount of man-hours you'd have to put into it will easily exceed how much you'd have spent on it anyway.
Supporters Sitting Duck Posted May 31, 2016 Supporters Posted May 31, 2016 the whole process takes loads of lapping to get the surface as close to true smooth perfection as possible see HS5 spending yonks with various grades of paste to get improved results the crowning is more than just jamming in a dremmel polishing stone in the end And he knows a "little" bit to say the least... (I know absolutely f*ck all by comparison) barrels are usually about 6.05 stock some stock barrels are better than others but still probably miles better than hacking up a bit of pipe and making a DIY barrel TBB are about 6.03, 6.02 or 6.01 - though too tight on longer barrels will very likely jam more, these tbb will in most cases increase fps a little Wide Bore are more used for hpa setups I think as the drop can be compensated easily if barrel is ok - just clean it and concentrate on hop/bucking if you wish to alter the barrel length a little maybe try a £20 one if on a real tight budget like zci/tornado (avoid madbull is mine and many others opinion - save up for the higher quality barrels) but often - people mess with barrels thinking it will change so much when in fact it don't or even make matters a little worse and the average DIY one will very likely to be quite $hit on par with hacked bits of pipe found in JBBG guns Think you could turn out other custom/bespoke bits n bobs that might function ok - but barrels ergh no I don't think so 3d print bits, make flash hider from delrin or stuff - loads of little bits you could knock up ok but precision barrels - nahhhhhh
Supporters ImTriggerHappy Posted May 31, 2016 Supporters Posted May 31, 2016 Is this a real thread or a wind up?
Supporters jcheeseright Posted May 31, 2016 Supporters Posted May 31, 2016 give it a few weeks and there'll be a 'help please' thread: "fitted my new barrel that I made out of some brass pipe and my accuracy and range have gone down the toilet, I think it's my tappet plate... could anyone advise a good material I can carve a new one from?"On the subject of barrels, in Japan Tokyo Marui OEM barrels sell second hand for more than prometheus/PDI go for new. Food for thought.
Supporters ImTriggerHappy Posted May 31, 2016 Supporters Posted May 31, 2016 On the subject of barrels, in Japan Tokyo Marui OEM barrels sell second hand for more than prometheus/PDI go for new. Food for thought. Nope that just another thing that proves Japanese consumerism is weird (45yr olds collecting barbies and trading cards).TM barrels are absolutely fine but nowhere near the same league as PDI or prommy. Japanese are the worlds worst at buying the same brand even though there is better on the market look at how well Nintendo consoles still sell.
Guest PT247 Posted May 31, 2016 Posted May 31, 2016 for my 2p worth... on my PDW Krytac the stock inner barrel is as good as a Prommy barrel of slightly longer length which suggests it is better quality as is shorter so in theory less fps (as it goes; on the chrono made no difference)
Sacarathe Posted May 31, 2016 Posted May 31, 2016 for my 2p worth... on my PDW Krytac the stock inner barrel is as good as a Prommy barrel of slightly longer length which suggests it is better quality as is shorter so in theory less fps (as it goes; on the chrono made no difference) Unless the system only had enough air volume for the default barrel, undervoluming can cause the BBs to decelerate in the barrel.
Supporters Sitting Duck Posted June 1, 2016 Supporters Posted June 1, 2016 Oh jeez lay off the science stuff a sec - my brain hurts.... just opened 3 cans of worms in 3 other forums in under 36hrs I've come back here for some peace & chill time
Supporters Samurai Posted June 1, 2016 Supporters Posted June 1, 2016 is shorter so in theory less fps Only if the cylinder is not matched to the barrel.
Supporters Sitting Duck Posted June 1, 2016 Supporters Posted June 1, 2016 just wondering was it too much science or a tarantula on her right breast that made her pass out ???
Guest PT247 Posted June 1, 2016 Posted June 1, 2016 Aye could be down to volume but it works fine with both SPR and PDW length barrels which suggests otherwise.
Sacarathe Posted June 1, 2016 Posted June 1, 2016 just wondering was it too much science or a tarantula on her right breast that made her pass out ??? What! Some of the first physics children learn is through a straw!
callumbagshaw Posted June 1, 2016 Posted June 1, 2016 I don't have any valuable input for this question sadly, but I can tell you that for everyone flummoxed by some of what has been said, this article is a really really good starting point on barrels & hop units. https://www.reddit.com/r/airsoft/comments/32epzw/a_beginners_guide_to_barrels_flat_hop_and_rhop/
Supporters ImTriggerHappy Posted June 1, 2016 Supporters Posted June 1, 2016 Size of my barrelI am guessing Derringer or at best ultra compact pistol?
Jambo88 Posted June 1, 2016 Posted June 1, 2016 I am guessing Derringer or at best ultra compact pistol? Sawn off derringer
Root Admin proffrink Posted June 1, 2016 Root Admin Posted June 1, 2016 What do you use the second barrel for?
Sacarathe Posted June 1, 2016 Posted June 1, 2016 Size of my barrel Ah, so you didn't read the thread.
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