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KWA M4 CQB Hop Up Bucking Replacement Question


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#1 DaTigah

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Posted 04 June 2008 - 11:58 AM

Hi, my name is DaTigah!

I have a question for all KWA M4 CQB users, yes CQB users.

What Hop Up Bucking (Brand, Type, anything) should I get for the KWA M4 CQB.

Make sure you know it fits inside any barrel. Also, before replying to my question, please assume that I will be using the stock Hop Up System and I do not plan on buying a new Hop Up System. I plan on buying a new bucking only.

Also, if you want tell me what tight bore barrel I should get with the Hop Up Bucking. Do not reply to the post if you will only be talking about inner barrels. I want to focus on talking about Hop Up Buckings for the KWA M4 CQB.

Thank you.

#2 wong fei hung

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Posted 04 June 2008 - 02:42 PM

good luck with this as your choice of barrel will effect your choice of bucking even if you are still using the stock hop up.  i plan to change my barrel too and have found out from other KWA users that the barrel and bucking compatability when using the stock hop up is difficult and requires much user finagling and research to make any combos fit.  sorry for run on sentence but i am going through the exact quagmire right now too, so like i said good luck and let me know if you found a combo that fits well with the KWA hop up unit.

#3 DaTigah

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Posted 04 June 2008 - 03:44 PM

Sure, I will notify you if I find anything important. Other than that, I am still open for tons of suggestions so keep them coming! I will not stop looking for an answer until I find one. If there is a KWA Representative looking at this topic right now, PLEASE HELP ME!

#4 DaTigah

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Posted 05 June 2008 - 04:22 PM

Okay. I want to ask anybody (anybody who currently owns and uses a KWA M4 CQB version) and I want to ask if the stock hop up is okay, meaning it works and serves it purpose. It may not be the best but I want to know if it is good enough stock.

#5 Guest_allizard_*

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Posted 05 June 2008 - 04:30 PM

I can't speak for stock performance on the CQB as I don't have one yet.  But the hopup unit is the same as regular M4 so I have done quite a few comparison.

The BEST FIT TB Barrel and Bucking combo is a Guarder + Firefly.   Unfortunately both of these items are little hard to find.

Other options is a Prometheus barrel + Systema bucking.  It's a little tight but it will work.  

Madbull Barrel also work with Systema bucking but it's a much tighter fit and will need to but a cut a little bit off on the rubber.  

I'm trying to locate a TM bucking right now.  if anyone know where I can buy one please let me know.

#6 vic_man4

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Posted 09 June 2008 - 11:44 AM

Does anyone know how good of a fit a DBC 6.01mm barrel is? cause I am intending on getting one but after reading some of the posts on this forum it makes me a bit unsure if I should get it, cause if it doesnt work then theres $50 out the window ;)
Heres the link if anyone wants it to try it out or whatever:
http://www.airsoftgi...roducts_id=3047

If I do get it, or someone else does, please post your findings on the Compatibility topic not hear, cause its all nice and neat over there.

#7 wong fei hung

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Posted 10 June 2008 - 03:33 PM

hey allizard what Systema bucking will work with that prometheus barrel?  i want to get a prometheus barrel and if i can coax the systema bucking to work with silicone lube i will get it so which Systema bucking is it that you said works even if a lttle bit tight?  thanks dude.

#8 Guest_allizard_*

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Posted 10 June 2008 - 04:51 PM

View Postwong fei hung, on Jun 10 2008, 04:33 PM, said:

hey allizard what Systema bucking will work with that prometheus barrel?  i want to get a prometheus barrel and if i can coax the systema bucking to work with silicone lube i will get it so which Systema bucking is it that you said works even if a lttle bit tight?  thanks dude.

I was using a soft Systema busking.

#9 vic_man4

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Posted 10 June 2008 - 05:34 PM

View Postallizard, on Jun 10 2008, 05:51 PM, said:

I was using a soft Systema busking.

Really, whats the difference between the soft and hard buckings, mind explaining allizard?

#10 Guest_allizard_*

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Posted 10 June 2008 - 09:48 PM

Simply put, if you are using a hard spring that shoot 420+ fps you should be using a hard one.  400 or less should be a soft one.

#11 wong fei hung

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Posted 11 June 2008 - 07:16 AM

and this should work for the m4 s too?  i failed to notice that this was a question for the CQB and not the M4S that i have but i am thinking the fit should be the same as i am sure the hop up unit is identical.

#12 vic_man4

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Posted 12 June 2008 - 01:54 PM

View Postwong fei hung, on Jun 11 2008, 08:16 AM, said:

and this should work for the m4 s too?  i failed to notice that this was a question for the CQB and not the M4S that i have but i am thinking the fit should be the same as i am sure the hop up unit is identical.

Correct me if Im wrong, but the only difference between the CQB and M4S or M4A1 is the cylinder type and Barrel design, a hopup bucking should work for both, if Im correct  B)

#13 DaTigah

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Posted 08 July 2008 - 05:55 PM

View Postallizard, on Jun 5 2008, 08:30 PM, said:

I can't speak for stock performance on the CQB as I don't have one yet.  But the hopup unit is the same as regular M4 so I have done quite a few comparison.

The BEST FIT TB Barrel and Bucking combo is a Guarder + Firefly.   Unfortunately both of these items are little hard to find.

Other options is a Prometheus barrel + Systema bucking.  It's a little tight but it will work.  

Madbull Barrel also work with Systema bucking but it's a much tighter fit and will need to but a cut a little bit off on the rubber.  

I'm trying to locate a TM bucking right now.  if anyone know where I can buy one please let me know.

Alright, well right now I have my new KM4A1 Carbine. SO a Guarder barrel and a Firefly bucking Combo...Okay, will that fit inside the stock KWA hop up unit.

Also wat length is the barrel?
Also, which Firefly bucking type should i get: Soft or Hard? (I am sticking to the stock KWA m120/400fps spring)

Also its hard to find a Guarder Barrel, which other barrel might work with a firefly.?

#14 vic_man4

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Posted 08 July 2008 - 06:21 PM

View PostDaTigah, on Jul 8 2008, 06:55 PM, said:

Alright, well right now I have my new KM4A1 Carbine. SO a Guarder barrel and a Firefly bucking Combo...Okay, will that fit inside the stock KWA hop up unit.

Also wat length is the barrel?
Also, which Firefly bucking type should i get: Soft or Hard? (I am sticking to the stock KWA m120/400fps spring)

Also its hard to find a Guarder Barrel, which other barrel might work with a firefly.?

www.kwausa.com to figure out the barrel length, and its everywhere all over this forums :lol:

#15 DaTigah

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Posted 09 July 2008 - 12:07 PM

View Postvic_man4, on Jul 8 2008, 10:21 PM, said:

www.kwausa.com to figure out the barrel length, and its everywhere all over this forums :lol:

Yea sorry thats my fault. Anyways I found out that the inner barrel is about 393mm.

What 6.03mm (NOT 6.01mm)barrel besides a Guarder Brand would fit with the Firefly Bucking on the Stock Hop Up Unit.?

Also which Firefly Bucking should  i get, soft or hard.?

Edited by DaTigah, 09 July 2008 - 12:10 PM.


#16 Guest_allizard_*

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Posted 09 July 2008 - 10:05 PM

Get the soft one.  Be prepare to spend the money.  Last time I paid $18 for just a piece of rubber call Firefly bucking.

#17 DaTigah

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Posted 11 July 2008 - 12:38 PM

How about a MadBull Tight Bore Ver 2 with a Firefly Bucking? Hmm? Would that work with the stock hop up system/chamber? :blink:

IF NOT, will the Firefly bucking work with the stock KWA Inner Barrel and System?

Edited by DaTigah, 11 July 2008 - 12:39 PM.


#18 Guest_allizard_*

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Posted 11 July 2008 - 11:55 PM

That combo didn't work for me.  MadBull Tight Bore barrel have a larger diameter.

#19 karMeister

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Posted 12 July 2008 - 01:23 AM

View Postallizard, on Jul 11 2008, 11:55 PM, said:

That combo didn't work for me.  MadBull Tight Bore barrel have a larger diameter.

Thats prob why they call it "Madbull" becuase they are bull barrels. (larger outer diameter)

#20 DaTigah

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Posted 12 July 2008 - 08:51 AM

Okay.... Can I just by a Firefly Bucking (soft) and install it on the STOCK inner barrel and the STOCK HOP UP UNIT??

Edited by DaTigah, 12 July 2008 - 06:25 PM.





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