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Longer tightbore barrel for my KWA SR7


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#21 TheWraith

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Posted 08 July 2013 - 08:34 PM

Ok.. this is where I am going with all this.. I recently played at jericho where one of the Karma group members had a KWA M4 and I was able to fire it..to say it was by far the smoothest, most accurate rifle I have ever shot is to say the least.. the gears were all shimmed and he had a Chimera mosfet and a prommy barrel as well as a lipo battery and all the trimmings..I'm telling you the guns performance stunned me..and I am currently in the process of making mine like that and he even offered to do the work.  I have had issues with the barrel being to short to the suppressor that there is some sort of "vortex" or something that throws the bb's every which way but straight and a longer barrel is needed to take it to the end of my suppressor thus my inquiry of the prommy barrel or even one of the KWA barrels..whichever parts I buy..i want the very best I can get my hands on..thus all the questions..

#22 tales

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Posted 08 July 2013 - 09:28 PM

I have the KWA M4 & a few other brands. KWAs M4 shoots great right out of the box. I like stainless steel barrels, now I'm thinking i went with the KWA barrel due to the length. I was unable to find a stainless steel in 6.02 X 395mm

Its a high quality barrel, Well made. You won't be disappointed & its 6.02

Besides the barrel,  I did some minor wire work. And added a Lonex A2 motor.

If you don't own the gun, try it box stock. You will be happy with the results!

#23 gcw360

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Posted 09 July 2013 - 06:01 AM

View Posttales, on 08 July 2013 - 06:05 PM, said:

Nickel teflon coated, like the frying pans in Target
That would be the KM Head barrels then.  The stock AEG KWA barrels are brass, non-coated. Also, the nickel-teflon coating on the KM Head barrel is far stronger than standard Teflon coatings.  It's actually extremely durable, does not peel, and has a very low friction coefficient.  It's a good thing!

#24 TheWraith

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Posted 09 July 2013 - 06:27 AM

I do own the gun..I have the KWA SR7..love it, but when I shot the other fellow's gun..the difference was substantial..I'm not talking about little things..I'm talking about big differences..in both smoothness, accuracy..and how well the gun was shimmed and in sync with all the other parts..I can only describe it as if the gun had no parts and just spit bb's out!

anyways..I will confess that I an very new to airsofting..my son talked me into getting into it and he and I love to go.. gives us well spent time together and get's me out of the shop from working..so in saying that, I'm saying I am not an expert in any of this..I don't know what the symbols or abbreviations mean half the time..  what's a KM head barrel?  LOL

#25 gcw360

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Posted 09 July 2013 - 06:40 AM

This is the KM Head barrel: http://store.kwausa....arrel395mm.aspx

It's the best barrel I have ever tested in a KWA.

#26 TheWraith

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Posted 09 July 2013 - 07:17 AM

I think I have to get the 509mm and cut it down..I need 17-1/2" in length..I like that KW barrel..and it's made for a KWA..so it makes sense to use it..

#27 tales

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Posted 09 July 2013 - 07:57 AM

View Postgcw360, on 09 July 2013 - 06:01 AM, said:

That would be the KM Head barrels then.  The stock AEG KWA barrels are brass, non-coated. Also, the nickel-teflon coating on the KM Head barrel is far stronger than standard Teflon coatings.  It's actually extremely durable, does not peel, and has a very low friction coefficient.  It's a good thing!

Thats the same barrel (different length) in your link. Post #2 :D

Edited by tales, 09 July 2013 - 08:49 AM.


#28 tales

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Posted 09 July 2013 - 08:32 AM

View PostTheWraith, on 09 July 2013 - 06:27 AM, said:

I do own the gun..I have the KWA SR7..love it, but when I shot the other fellow's gun..the difference was substantial..I'm not talking about little things..I'm talking about big differences..in both smoothness, accuracy..and how well the gun was shimmed and in sync with all the other parts..I can only describe it as if the gun had no parts and just spit bb's out!

anyways..I will confess that I an very new to airsofting..my son talked me into getting into it and he and I love to go.. gives us well spent time together and get's me out of the shop from working..so in saying that, I'm saying I am not an expert in any of this..I don't know what the symbols or abbreviations mean half the time..  what's a KM head barrel?  LOL

Sorbo Pad?
My sons G&G CM shoots like that, the gearbox alone is twice the price of the stock gun.

Im not sure, i think the KWA barrels were made exclusively for KWA by KM head. Great Barrel!
http://www.spartanim...&category_id=58

Edited by tales, 09 July 2013 - 08:40 AM.


#29 gcw360

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Posted 09 July 2013 - 09:03 AM

View PostTheWraith, on 09 July 2013 - 06:27 AM, said:

I do own the gun..I have the KWA SR7..love it, but when I shot the other fellow's gun..the difference was substantial..I'm not talking about little things..I'm talking about big differences..in both smoothness, accuracy..and how well the gun was shimmed and in sync with all the other parts..I can only describe it as if the gun had no parts and just spit bb's out!

anyways..I will confess that I an very new to airsofting..my son talked me into getting into it and he and I love to go.. gives us well spent time together and get's me out of the shop from working..so in saying that, I'm saying I am not an expert in any of this..I don't know what the symbols or abbreviations mean half the time..  what's a KM head barrel?  LOL
That smooth crisp feeling that you are feeling can be from a number of things....not the least of which is a good LiPo and MOSFET (Chimera).  The trigger response is amazing. Add to that a properly shimmed gearbox and the whole experience is at a different level.

#30 TheWraith

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Posted 09 July 2013 - 09:40 AM

I agree gcw360.. it is a combination of those things..

I seriously wish there were more "Airsoft gunsmiths" like this Karma fellow..seems to be a ton of wannabee's and tinklers out here where I live..

also..getting one of those Black Talon Chimera MOSFETS is like pulling teeth.. there's no business phone number or customer service number..it's all via e mail and at the sole discretion of the owner to get back to you....one day..not a smart way to run a business if you ask me

Tales..what is that Sorbo Pad??? and what was the gearbox he bought? curious here..

Edited by TheWraith, 09 July 2013 - 09:42 AM.


#31 tales

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Posted 09 July 2013 - 12:06 PM

you can search Sorbo Pads, also try You Tube. I dont want your thread to go off course.

Gearbox: I used a CNC machined 7075 re-enforced V2 gearbox & added a mixture of aftermarket parts. Correct Lubes & properly shimmed By IMO, a great airsoft "Tech"

FWIW, The KWA stock barrel out performs most aftermarket barrels, Honestly we do get tighter grouping with the KM head barrel.

#32 TheWraith

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Posted 09 July 2013 - 04:07 PM

keeping this topic on course..I believe that if those that want to use a suppressor, needs to make sure the barrel goes to the end of the suppressor and not stop inside of it..I love the look of my SR7 with a suppressor, but the barrel I put into it did not go to the end and something happens in that area..it's a shame they don't make various lengths in like 1/2" increments but I can see how that would become cost prohibitive..it would be nice if they had a barrel cutting/crowning service though for those that are afraid to make the attempt themselves

#33 tales

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Posted 09 July 2013 - 05:35 PM

I dont know much about guns. Some of my co-workers do. They gave me advice when i cut my barrels.
I used the table portaband saw at work, it was a perfect cut. The dremel requires a little more time, not much.

From my understanding deer hunters do cut down there barrels, for a shorter gun when in wooded areas,

I agree, if i was to use a mock suppressor i would want my inner barrel to go into it.
What about your cylinder? looks like you will need a type B

If you do change the cylinder, you should ask what if anything should be changed while the GB is open.
There are some very knowledgeable members here.

Good Luck!!!

#34 TheWraith

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Posted 09 July 2013 - 06:05 PM

I know that when they swapped out my barrel for the longer tightbore barrel ( it's too short) they also swapped out the cylinder..I took a picture and e mailed it to myself, but cannot open the file..i will wait till my son comes home and have him do it. I will see if I need a new cylinder for the newer longer barrel i am buying (the KWA tightbore) and have one put in as well.. I also want an R hop installed and a barrel lock ( Hunterseeker5 sells them) and I am looking at those Sorbo pads that you linked me too.  I might even change out my piston for an even better one, but will see..right now I'm just waiting for the MOSFET..I ordered 3 of them.. 1 for my gun..1 for my son's and a spare since they are so hard to get these days

#35 tales

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Posted 09 July 2013 - 06:40 PM

Im not sold on mosfets yet. Ive been using them for decades, They are limited in airsoft. Hey gotta start some ware. Airsofters love them.

Most just wait for the lipo to loose too much voltage, by ear. That not right.
My RC speed control is set to cutoff lipos at 3.3 volts a cell. 10V for a 3 cell pack.

This one looks interesting. seem to have more features then most. Main feature is the lipo cutoff
http://tigertactical...box-p-2526.html

Edited by tales, 09 July 2013 - 06:46 PM.


#36 TheWraith

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Posted 09 July 2013 - 07:15 PM

that's the one I am waiting for..the Black Talon Chimera MK2..that's it..but it's hard to get them..I've been waiting for over a month now..glad I ordered 3..lol I have a Lipo that's a little deadly..here's a link..they work great..and last a very long time..

http://hobbyking.com...RSOFT_Pack.html

notice on tigertactical it says "notify me"? they are out of stock..everyone is..

Edited by TheWraith, 09 July 2013 - 07:22 PM.


#37 TheWraith

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Posted 09 July 2013 - 07:17 PM

the 2.0 Lipo works great and last a very long time, but the discharge is 15c to 25 which is a lot for our guns..

Edited by TheWraith, 09 July 2013 - 07:19 PM.


#38 tales

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Posted 09 July 2013 - 08:57 PM

Cool, Post your thoughts on that mosfet. Where did you get it from. I guess there are airsofters that know what mosfets are capable of doing.

15C-25C Is what the battery is capable of discharging, Your AEG, won't draw that many amps, unless theres a short or broken gear etc.  11.1 volts could do more damage.

I think that mosfet protects agents that, with an internal fuse.

Edited by tales, 09 July 2013 - 09:03 PM.


#39 TheWraith

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Posted 09 July 2013 - 09:37 PM

actually, my son was the one who suggested we get mosfets for our guns since we run with the 2.0 Lipo's and wanted a way to monitor usage to avoid running the batteries dead..the guy at our local airsoft store had one of these, but it was the older version and not the MK2..I told him we wanted the latest version and paid on the spot for them..the only issue is it's difficult to get ahold of anyone at Black Talon Concepts..like I was saying there is no phone numbers and you are at the mercy of someone getting back eventually..it's like pulling teeth, but anyways,,these mosfets are suppose to give you a wide variety of discharge choices or bursts and monitor your  Lipo battery and actually shut them off if the voltage gets to 3.7 so you don't ruin them

I like them because they replace the contacts in your trigger with a button contact and really makes a difference in performance.. as soon as I get mine installed and up and running, I will post a whole review on it and my tricked out SR7

I have plans to also get a Paratrooper SAW and might install the 3rd mosfet in it..I haven't decided yet..I would love to hook the SAW up to a Polar Star..heh heh heh

Edited by TheWraith, 09 July 2013 - 09:39 PM.


#40 tales

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Posted 09 July 2013 - 11:12 PM

My old team mate can't get 2/3 cell packs. He can get lipos, My son uses a 7.4V 4000 mAh 35C - 70C in a stock MP5a4 gearbox
No worries with voltage cutoff when using that battery.




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