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Carbine VS CQB


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#1 first shooter

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Posted 28 May 2008 - 07:14 PM

Last night I ordered the KWA M4A1 CQB from Airsplat, Their item descriptions say that it's specs are virtually the same as the KWA M4A1 Carbine. Mainly what I am focused on here is that their website says that the CQB is 400+fps. WRONG ! :angry:
Today I spoke with a nice lady @ KWAusa and she confirmed what I didn't want to hear. The CQB is shooting below 350fps.  
  I really like the KWA line, I want the CQB model. I like a shorter length rifle.

  My questions are:
  What are the differences that allow the Carbine to shoot 50+ fps more ?
     According to the KWA Pro Shop, they share ALL the same internal parts
How can I squeeze 400-410 fps out of the CQB without causing accelerated wear ?
   It should be easy if the Carbine can do it.

  Bottom line: How will I get my CQB to shoot 400+ fps ?  Reliably.
          
                                                                     Thank-you,  First Shooter

#2 Guest_Inu One_*

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Posted 29 May 2008 - 08:35 AM

The CQB has a higher ROF but shoots below 350FPS.  The major differences "known" to us are the shorter barrel and cylinder, everything else appears to the same including the M120 springs.

#3 first shooter

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Posted 29 May 2008 - 10:37 AM

I was told the ROF and FPS differences of the carbine and CQB are a product of slight differences inside the
mech box. (gears,porting)

  I guess it's one of those engineering issues.  If you want ROF, you will sacrifice FPS. Likewise if you want FPS, you will lose ROF.   Sounds to me it's ALL in the gears.

Edited by first shooter, 29 May 2008 - 10:45 AM.


#4 Guest_allizard_*

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Posted 29 May 2008 - 04:37 PM

I haven't open up the CQB gearbox yet.  but looking on the external of the gearbox it's got a much larger port then regular M4.  Hence my thoery is CQB have less air push through the nozzle.

#5 first shooter

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Posted 02 June 2008 - 07:01 AM

Yes sir, I believe you are correct, the boxes are differentin in that the CQB has a larger port than the M4.
  Also I think the gears might be slightly different ,which might assist the higher ROF in the CQB.  What do you think ?

I canceled my order of the CQB and ordered the M4.

Let me ask the important question:
  If I were to take my M4 and put the CQB barrels on it, Would there be any problems I am unaware of ?
No other changes, just a barrel swap.


                     Thanks

Edited by first shooter, 02 June 2008 - 07:04 AM.


#6 Guest_allizard_*

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Posted 02 June 2008 - 05:07 PM

View Postfirst shooter, on Jun 2 2008, 08:01 AM, said:

Yes sir, I believe you are correct, the boxes are differentin in that the CQB has a larger port than the M4.
  Also I think the gears might be slightly different ,which might assist the higher ROF in the CQB.  What do you think ?

I canceled my order of the CQB and ordered the M4.

Let me ask the important question:
  If I were to take my M4 and put the CQB barrels on it, Would there be any problems I am unaware of ?
No other changes, just a barrel swap.


                     Thanks

I have installed quite a few aftermarket kits.  It should work.  Some outer barrels with be a tight fit.  But a little sanding will do the trick.

#7 Fokai

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Posted 02 June 2008 - 07:08 PM

View Postallizard, on Jun 2 2008, 06:07 PM, said:

I have installed quite a few aftermarket kits.  It should work.  Some outer barrels with be a tight fit.  But a little sanding will do the trick.

Inversely, If one was to take a CQB to get it to shoot the higher FPS..what internals are different from the carbine vs the CQB that would need to be switched in order to attain the carbine's velocity?  Aside from maybe changing out to a TB barrel & hop..

#8 Guest_allizard_*

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Posted 03 June 2008 - 02:33 PM

Like I said, CQB have a larger than normal ported cylinder.  If you install a type 1 or type 0 cylinder the FPS will most likely to go up.  That said, keep in mind opening the gearbox wiithin the 45 days will void your warranty.  Besides, if you are not sure about this subject, it best to void doing anything.

#9 first shooter

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Posted 03 June 2008 - 04:58 PM

allizard,  thanks for the insight. Might I add, You are everywhere! I've seen you in other places.

    Guys, He knows what he is talking about!

  Anyhow, I think I will put the KWA CQB barrels on my KWA carbine.
It's OK, I don't CQBattle so I won't be welting anybody. I just want a bad-a** CQB gun.

#10 first shooter

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Posted 04 June 2008 - 09:35 AM

Well, I don't have to worry about doing a CQB barrel swap on my Carbine for a while. I just received my new gun. It's a CQB !!! Not the carbine that I paid for!!!


   Damn, I didn't realize that "a**" was such a profanity !   a** ,a**, a**.
  LOL,   Sorry girls,  I'll try not to speak with such vulgarity in the fuure.

#11 vic_man4

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Posted 05 June 2008 - 01:51 PM

Honestly, If you want more FPS outta your gun, the best way to do it and the least risky is just to get a high quality tightbore, it will give you more FPS from 20-40. And another MASSIVE plus is the fact that you get a whole lot more accuracy out of your gun too. I would also suggest a newer hop up bucking to increase your FPS and accuracy a little. Check out AIRSOFTGI at www.airsoftgi.com They are great, customer service is amazing and the have a whole section on tightbores and hopup replacemetns/modifications. Its a quick and easy way to upgrade your guns accuracy and squeeze a bit more fps for under $100. The tightbores are usually around $50 and the buckings are no more than $15.

Any questions just PM me

#12 first shooter

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Posted 05 June 2008 - 02:01 PM

Thanks. I will consider that. In fact, I'm gonna go shopping NOW ! :D

#13 Guest_allizard_*

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Posted 05 June 2008 - 04:16 PM

View Postfirst shooter, on Jun 3 2008, 05:58 PM, said:

allizard,  thanks for the insight. Might I add, You are everywhere! I've seen you in other places.

    Guys, He knows what he is talking about!

  Anyhow, I think I will put the KWA CQB barrels on my KWA carbine.
It's OK, I don't CQBattle so I won't be welting anybody. I just want a bad-a** CQB gun.


Err... thanks.   :lol:

#14 vic_man4

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Posted 08 June 2008 - 09:54 AM

View Postfirst shooter, on Jun 5 2008, 03:01 PM, said:

Thanks. I will consider that. In fact, I'm gonna go shopping NOW ! :D

If that was directed to me about the inner barrel then no problem  :lol:
correct me if Im wrong lol




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