Tanio Koba / KJW M4 GBBR Basic Information and FAQ

beanie · April 11th, 2012, 05:58

Has anyone tried those stanmags yet?

SKI · April 14th, 2012, 11:18

Installed the V2 bolt the other day. Thanks Ken. Gives the gun some more kick.

Saberwing · April 16th, 2012, 19:03

While lubing up my o-rings, I tightened the screw that holds the mag together too tight and managed to snap it. Anybody have any ideas on how to replace it?

I'd also like to congratulate us on being the second most viewed and replied to topic in this section hahaha

audi_bhoy · April 16th, 2012, 19:43

You will have to extract the broken part of the screw, which will surely be a pain, using left handed drills and screw extractors. Then you'll have to hit a machine shop to buy a new screw of same dimension and threading.

Saberwing · April 16th, 2012, 19:45

Quote:

Originally Posted by audi_bhoy

You will have to extract the broken part of the screw, which will surely be a pain, using left handed drills and screw extractors. Then you'll have to hit a machine shop to buy a new screw of same dimension and threading.

Already extracted the broken part with pliers. Wasn't that bad cause I just took the mag apart. I'll check a machine shop, thanks.

audi_bhoy · April 16th, 2012, 22:23

Also make sure your mag's threading aren't damage too, otherwise, use a tap before putting everything back together !

Saberwing · April 20th, 2012, 21:07

Quote:

Originally Posted by audi_bhoy

Also make sure your mag's threading aren't damage too, otherwise, use a tap before putting everything back together !

Thanks Audi_bhoy. I also need to buy a metal lower now -_- My second plastic one is cracking in front of the buffer mount.

audi_bhoy · April 20th, 2012, 22:26

Lucky enought there is some available now, and for 100$, which is such a fair price !!

Saberwing · April 20th, 2012, 22:27

Quote:

Originally Posted by audi_bhoy

Lucky enought there is some available now, and for 100$, which is such a fair price !!

Yeah I know at 007, but they're sold out according to the site already

audi_bhoy · April 21st, 2012, 02:20

Surprise me haha!!

D2D · April 21st, 2012, 23:22

Hi guys - so my KJW M4's been giving me problems since day one. Instead of typing up a wall of text, I thought I'd just make a video.

Defective KJW M4 - YouTube

If I shim the upper receiver so as to lessen the horizontal play of the bolt carrier, the dust cover and bolt catch start to function as they should. The failure to go into battery problem is still there, presumably because I haven't eliminated the vertical play of the bolt carrier.

So hopefully if I'm right, I just need to replace the bolt carrier. I might be wrong, though - I don't have a properly functioning KJW M4 to compare with. Can you guys check how much play there is between your guide rod and your v2 bolt carrier?

Rommen · April 22nd, 2012, 19:08

Use V1 bolt carrier and all related V1 parts. It WORKS, and imo the elastic band is good. It takes stress off other components and puts it on a $6 replaceable part. As a side note, always hit the forward assist after reloading to make sure bolt is in battery, it's sop

D2D · April 23rd, 2012, 14:55

I would if I could, but I assume KJW doesn't sell v1 parts anymore. IF I'm right about the source of all my problems, then I figure I'll just get another v2 bolt from KJW or hold out for t_hum's bolt. I'm really hoping that I'm right and that it's not some dimensional problem with the upper receiver or something...

So with that said, can anyone please check their v2 bolts, like in the addendum video? Or even better, some kind soul can meet me in the GTA so I can compare? I can bring the coffee and donuts?

beanie · April 24th, 2012, 11:54

How often do you clean/oil the bolt carrier and bolt?
My v2 bolt carrier parts have the same amount of wiggle when taken apart but since the bolt carrier is held in place by fitting together with the hop up and the bolt I've never noticed.

My dust cover rarely opens properly from charging as well.

Cj Radge · April 24th, 2012, 15:23

Hi D2D. I did the exact test shown in your videos. I have pretty much the same play in your first video and addendum video. I also use digital caliper, results: guide rod 4mm. guide rod hole 4.15 ( only 0.5 difference from yours but not sure if that is enough to cause your problem).

Mine is working flawlessly though.

I noticed two unusual:
1. Your plastic bolt head seems to have more play than mine.
2. For the bolt lock, your bolt carrier was unusually more forwarded exposed. It should be more backward when locked. Mine is only exposing 10mm of bolt carrier. (note: bolt carrier only, Plastic bolt was not included in the 10mm measuremet)

Hope it helps isolate the problem.

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April 14th, 2012, 11:18	#722
SKI Trader rating Join Date: Oct 2002 Location: Mississauga	Installed the V2 bolt the other day. Thanks Ken. Gives the gun some more kick. __________________ www.ctmotorsports.ca

April 16th, 2012, 19:03	#723
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	While lubing up my o-rings, I tightened the screw that holds the mag together too tight and managed to snap it. Anybody have any ideas on how to replace it? I'd also like to congratulate us on being the second most viewed and replied to topic in this section hahaha __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon Last edited by Saberwing; April 16th, 2012 at 19:30..

April 21st, 2012, 23:22	#731
D2D Trader rating Join Date: Oct 2011 Location: Toronto	Hi guys - so my KJW M4's been giving me problems since day one. Instead of typing up a wall of text, I thought I'd just make a video. Defective KJW M4 - YouTube If I shim the upper receiver so as to lessen the horizontal play of the bolt carrier, the dust cover and bolt catch start to function as they should. The failure to go into battery problem is still there, presumably because I haven't eliminated the vertical play of the bolt carrier. So hopefully if I'm right, I just need to replace the bolt carrier. I might be wrong, though - I don't have a properly functioning KJW M4 to compare with. Can you guys check how much play there is between your guide rod and your v2 bolt carrier? Last edited by D2D; April 24th, 2012 at 00:58..

April 11th, 2012, 05:58	#721
beanie Trader rating Join Date: Apr 2011	Has anyone tried those stanmags yet?

April 16th, 2012, 19:43	#724
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	You will have to extract the broken part of the screw, which will surely be a pain, using left handed drills and screw extractors. Then you'll have to hit a machine shop to buy a new screw of same dimension and threading.

April 16th, 2012, 22:23	#726
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	Also make sure your mag's threading aren't damage too, otherwise, use a tap before putting everything back together !

April 20th, 2012, 22:26	#728
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	Lucky enought there is some available now, and for 100$, which is such a fair price !!

April 21st, 2012, 02:20	#730
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	Surprise me haha!!

April 22nd, 2012, 19:08	#732
Rommen Trader rating Join Date: Jul 2011 Location: Mississauga, Ontario.	Use V1 bolt carrier and all related V1 parts. It WORKS, and imo the elastic band is good. It takes stress off other components and puts it on a $6 replaceable part. As a side note, always hit the forward assist after reloading to make sure bolt is in battery, it's sop

April 23rd, 2012, 14:55	#733
D2D Trader rating Join Date: Oct 2011 Location: Toronto	I would if I could, but I assume KJW doesn't sell v1 parts anymore. IF I'm right about the source of all my problems, then I figure I'll just get another v2 bolt from KJW or hold out for t_hum's bolt. I'm really hoping that I'm right and that it's not some dimensional problem with the upper receiver or something... So with that said, can anyone please check their v2 bolts, like in the addendum video? Or even better, some kind soul can meet me in the GTA so I can compare? I can bring the coffee and donuts? Last edited by D2D; April 24th, 2012 at 00:58..

April 24th, 2012, 11:54	#734
beanie Trader rating Join Date: Apr 2011	How often do you clean/oil the bolt carrier and bolt? My v2 bolt carrier parts have the same amount of wiggle when taken apart but since the bolt carrier is held in place by fitting together with the hop up and the bolt I've never noticed. My dust cover rarely opens properly from charging as well.

April 24th, 2012, 15:23	#735
Cj Radge Trader rating Join Date: Sep 2011 Location: Philippines, Manila	Hi D2D. I did the exact test shown in your videos. I have pretty much the same play in your first video and addendum video. I also use digital caliper, results: guide rod 4mm. guide rod hole 4.15 ( only 0.5 difference from yours but not sure if that is enough to cause your problem). Mine is working flawlessly though. I noticed two unusual: 1. Your plastic bolt head seems to have more play than mine. 2. For the bolt lock, your bolt carrier was unusually more forwarded exposed. It should be more backward when locked. Mine is only exposing 10mm of bolt carrier. (note: bolt carrier only, Plastic bolt was not included in the 10mm measuremet) Hope it helps isolate the problem. __________________ Unseen but Certain

Tanio Koba / KJW M4 GBBR Basic Information and FAQ

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