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Need help building new upper receiver for kwa m4

upper receiver compatible outer barrel keymod rail

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#1 jmkainz1

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Posted 20 June 2014 - 10:17 AM

Hi, I am a long time KWA owner (almost 4 years) and I am interested in making a new upper receiver for my KWA m4. This is the rail i would like to use this key mod rail , a kwa replacement upper receiver, and this outer barrel. The only reason i want to build a new upper is because i have seen online that to put the rail on the current upper i would have to take the delta ring off which seems like a hassle so here are my questions.
1) If i do make a new complete upper, are the parts that i have selected compatible with each other?
2) If i do make a new complete upper, do i need any other parts than the ones linked above to make it.
3) Is there any way to easily remove the delta ring other than to melt the delta ring off?

Thanks for your time


#2 vanevery

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Posted 21 June 2014 - 12:02 PM

I believe everything should work,

I may suggest that the money you can save by just taking the necessary steps to remove the Delta Ring is worth it.
- Separate Upper form Lower.
- Remove charging handle, spring, and retainer clip.
- Remove Inner Barrel.
- Apply heat via hair dryer or heat gun to the targeted area,
I suggest targeting he heat just inside the Upper Receiver so it heats inside out.
Give it 20-30 minutes with the hair dryer, 10-15 minutes with the heat gun.
- Clamp down Upper Receiver
- Use Armorers Wrench or Delta Ring Removal Tool and remove Delta Ring.

#3 Chuck S

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Posted 21 June 2014 - 12:58 PM

Free floating an airsoft barrel does nothing but add "style" to the gun.  Will still shoot just as bad (or good) after this $90 styling item.  Your money and only you know how hard you worked for it.

But there's no reason I can see that it won't mount to your existing receiver and the stock outer barrel will fit just fine after you knock off the front sight tower.  Then you need to mount a front sight of some sort -- more expense.

Gun may look kooler -- to some (all in the eye of the beholder) -- but it's no more effective.

-- Chuck

#4 vanevery

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Posted 21 June 2014 - 02:08 PM

View PostChuck S, on 21 June 2014 - 12:58 PM, said:

Free floating an airsoft barrel does nothing but add "style" to the gun.  Will still shoot just as bad (or good) after this $90 styling item.  Your money and only you know how hard you worked for it.

But there's no reason I can see that it won't mount to your existing receiver and the stock outer barrel will fit just fine after you knock off the front sight tower.  Then you need to mount a front sight of some sort -- more expense.

Gun may look kooler -- to some (all in the eye of the beholder) -- but it's no more effective.

-- Chuck

I disagree with this in part.
The function of the Free Float RIS is to allow some movement, should there be any, in the rail system yet not move the Outer Barrel as to affect accuracy.

#5 Chuck S

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Posted 22 June 2014 - 04:06 AM

Free floating the barrel in any gun does indeed remove the connection between the barrel and handguard.  This can mitigate effects like bending the barrel with sling tension, barrel harmonics when the gun fires, and heat -- none of which occur in an AEG.  In airsoft there is no meaningful benefit as practical accuracy still remains man-sized not dime-sized.

Meaningful improvements in airsoft accuracy can come from different BBs and higher quality barrels. Airsoft is in many respects much more complicated than cartridge guns.  Variations in BB mass and quality can take a lot of experimentation to find what works best in a specific gun.

For the $90 under consideration here I'd fit a premium barrel, something that's documented to improve accuracy.

But don't completely misunderstand me.  I'm as guilty of "Barbie-for-Boys" as the rest of us and fully understand doing or wanting stuff "just cuz!"  :)  It's our decision to spend our disposable income the way we want.

-- Chuck

Edited by Chuck S, 22 June 2014 - 04:10 AM.


#6 gcw360

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Posted 22 June 2014 - 01:43 PM

View PostChuck S, on 22 June 2014 - 04:06 AM, said:

Free floating the barrel in any gun does indeed remove the connection between the barrel and handguard.  This can mitigate effects like bending the barrel with sling tension, barrel harmonics when the gun fires, and heat -- none of which occur in an AEG.  In airsoft there is no meaningful benefit as practical accuracy still remains man-sized not dime-sized.

Meaningful improvements in airsoft accuracy can come from different BBs and higher quality barrels. Airsoft is in many respects much more complicated than cartridge guns.  Variations in BB mass and quality can take a lot of experimentation to find what works best in a specific gun.

For the $90 under consideration here I'd fit a premium barrel, something that's documented to improve accuracy.

But don't completely misunderstand me.  I'm as guilty of "Barbie-for-Boys" as the rest of us and fully understand doing or wanting stuff "just cuz!"  :)  It's our decision to spend our disposable income the way we want.

-- Chuck
:tsuki: you finally admit to Barbie-for-boys.....congrats!





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