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New Tightbore Barrel! Km Head 509Mm X 6.02Mm

TBB KM HEAD tightbore 509

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#21 greatwatermelon

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Posted 09 November 2011 - 02:23 AM

View Postmochipwr1231, on 07 November 2011 - 11:02 AM, said:

The techs in my area say that 6.03s offer more range and accuracy than 6.01s but the .01s offer better groupings and fps. Is this true? And if so where do the 02s stand?

Did you know that some people also say that 6.08mm offers even more range and accuracy than any other tighter tightbore?

The debate question to the best bore size, for the longest time, has been "What is the magic number?" Some believe is 6.03, some believe it's 6.05, some believe it's 6.08, while general consensus has come to believe that tightest without jamming is best, which is 6.01. I won't say which is true but hopefully you'll get the general picture of where debate going, if I said, people who claim 6.03mm is the best has seen it out perform any other tight bore. People who claim 6.05mm is the best has seen it out perform any other tight bore. People who claim 6.08mm is the best has seen it out perform any other tight bore. People who claim 6.01mm is the best has seen it out perform any other tight bore. Repeat this for 6.02, 6.04, and so on.

Frankly, I can tell that the people in this thread who use or look forward to the 6.01mm and 6.02mm tightbore barrels by Edgi and KM, know that the quality of the inner barrel is more important the bore size, and would not have used these brand tight bores if they didn't see better results.

Probably why there is so much debate and different results is because people are simply comparing bore sizes rather than the quality of the inner barrel. Ever heard people claim that their PDI 6.05mm shoots better than their Prommy 6.03mm? Yet you also have to realize that the PDI is like 3 times more expensive than the Prommy barrel, and then wonder that maybe there is really more than just the bore size. A few years back, there was some lab results that one group came out with that showed the circular consistency of the inner barrel. Believe it or not, when you zoom in to microscopic levels where the human eye can't simply tell, barrels are not perfectly circle. The ones that are more circular and straighter, throughout the barrel than others, are cut and finished more precisely than others. In that article, even tough the Prommy proved to be more circular than majority of the other brands, PDI showed to be even more precise, which makes sense to how people attained better results.

This idea of a smooth, precise, more circular bore through a barrel is consistent with the idea that when a brass barrel smooths out (micro-hone) that it becomes more accurate and thus performs better at farther ranges.

#22 niko_gpsy

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Posted 09 November 2011 - 09:35 AM

You know now that I think about it I have read an article that tries to argue on the side of "air cushion theory" and claims that a 6.08 barrel is more accurate with better range than a standard tbb.  No definite answers though........................

#23 greatwatermelon

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Posted 09 November 2011 - 11:32 AM

Yeah. No definite answer, just only a theory. Do you know where that forum thread about "air cushion theory" is again?

#24 niko_gpsy

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Posted 10 November 2011 - 05:02 AM

View Postgreatwatermelon, on 09 November 2011 - 11:32 AM, said:

Yeah. No definite answer, just only a theory. Do you know where that forum thread about "air cushion theory" is again?
There was an article I read last year.  It wasn't from any particular forum if I remember correctly.  Google it and you shall find............................. ;)

#25 toast1012

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Posted 23 November 2011 - 11:17 PM

So just use 5.98 +-.02 with the stock barrel it should pone, right?

#26 gcw360

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Posted 24 November 2011 - 06:26 AM

Yes.

#27 sdk1968

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Posted 12 December 2011 - 11:39 AM

ok got one of these on the way for my brand new sr12... we'll see how much difference it makes if any from the stock barrel here in the north central state of Ohio.  :-)

#28 niko_gpsy

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Posted 13 December 2011 - 03:35 PM

View Postsdk1968, on 12 December 2011 - 11:39 AM, said:

ok got one of these on the way for my brand new sr12... we'll see how much difference it makes if any from the stock barrel here in the north central state of Ohio. :-)

I think you will be pleasantly surprised. Unless, you totally screw up your hop up. :P

#29 gcw360

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Posted 13 December 2011 - 03:59 PM

Agreed, you will like the barrel!

#30 sdk1968

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Posted 13 December 2011 - 06:10 PM

:rofl1: :rofl1:  you guys have no faith in me at all eh?

seriously though im very careful and will be on this barrel swap as well.

went thru my regular KWA M4a1 last nite and did my year end clean, check, lube and run thru and got it ready for the next season, which for me will start in January.  :rolf2:

#31 sdk1968

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Posted 20 December 2011 - 04:46 AM

hey guys i got a question on this barrel that may be good for other people to know...


this barrel does appear to be Nickel or nickel coated instead of the jsut brass type that i usually get from you guys...  no problem there..

but i dont physically "see" that teflon liner inside.... is this how these are?

and i thought these were "black" from the pix?

do tell....

Edited by sdk1968, 20 December 2011 - 04:48 AM.


#32 niko_gpsy

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Posted 24 December 2011 - 06:57 AM

They are kind of look nickel plated and may have a gun smoke finish.  The picture makes it look darker than it actually is.
Or we don't like you and sent you a bad one..................... :P  LOL
Just messing with you Sean. :D

#33 sdk1968

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Posted 24 December 2011 - 09:28 AM

thanks NG!

sure hope you guys like me cause my KWA collection is up to 4 rifles now and lots of extra goodies from you all.....  

if you dont like me your showing it in my wallet.

hey wait a minute thats how my ex "got over" on me........  thru the wallet.

#34 gcw360

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Posted 24 December 2011 - 09:49 AM

View Postsdk1968, on 24 December 2011 - 09:28 AM, said:

thanks NG!

sure hope you guys like me cause my KWA collection is up to 4 rifles now and lots of extra goodies from you all.....  

if you dont like me your showing it in my wallet.

hey wait a minute thats how my ex "got over" on me........  thru the wallet.
Sorry we didn't get to you and your $$$ before your ex.  We would like collection go to 8 guns and beyond.  The KM Head is indeed nickel plated thus the silvery gray color.

#35 KWA057

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Posted 26 December 2011 - 09:28 PM

Will the km head tbb be available in different length than 395 and the 509 one such as like a 425 or 455mm tbb.

#36 gcw360

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Posted 27 December 2011 - 08:52 AM

Answered by Allizard in the other KM Head thread.
http://kwausa.com/fo...l=&fromsearch=1

#37 KWAndrew

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Posted 06 February 2012 - 09:48 PM

does this inner barrel fit a KWA SR7? I will be putting a barrel extension on it as well.

and any testimonials on its performance? I dont know whether to purchase this or wait till I see an edgi 509 on the market

#38 gcw360

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Posted 07 February 2012 - 03:42 AM

Given the length of the SR7 I would recommend the 395MM KM Head: http://store.kwausa....arrel395mm.aspx

509mm is a lot to try to cover up unless you are changing the outer barrel too.

#39 KWAndrew

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Posted 07 February 2012 - 09:25 AM

Well I wanted to get more range out of the rifle, and I had done my research and found out the devgru outter barrel is about 9.4 inches long, and with a gemtech HALO mock suppressor, which adds 6.93 inches, I thought I would be able to cover up the length of this barrel, considering you lose about 4 inches of the barrel inside of the actual rifle?

Am I correct with my calculations or am i being a total nub?

#40 gcw360

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Posted 07 February 2012 - 09:34 AM

The barrels are the following:
SR7 = 273mm = 10.75"
M4   = 395mm = 15.55"
M16 = 509mm = 20.04"

If the Halo adds 6.93" then you will have 2.36" of inner barrel sticking out with the 509mm barrel...give or take.





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