Tanio Koba / KJW M4 GBBR Basic Information and FAQ

Saberwing · July 2nd, 2011, 08:09

Quote:

Originally Posted by beanie

I'm having my first issue with my gun. In full auto mode it will shot once or twice and then the trigger locks just like when you dry fire (the bolt carrier always closes). If I cock it again it will fire 1 or 2 shoots and then lock again. The gas pressure in the magazines is high.
In semi SOMETIMES it shoots about 6 shots (each shot weaker than the last) then locks. After I cock it again it will shoot, the first shot will be strong then the rest weaker kind of like when it cycles it doesn't collect more gas, only when I pull the cocking handle does it have a strong shot. Sometimes it will only shoot 1 shoot per cocking in semi.
Also I can feel a spring vibrating when the gun locks.
Any clues?:banghead:

I noticed the same thing yesterday when I was playing. However, It seemed to go away once I gave the buffer tube one more full rotation into the receiver.

Heerven · July 2nd, 2011, 10:36

I have the same problem. I shoot about 3 to 4 shot in full auto and after the gun jam. In semi If I shoot around 6 shots very fast it does the same thing. I was wondering if it's the Craddle velocity reducer the problem. I didn't try it stock since I got it.

George Burdell · July 2nd, 2011, 13:54

Quote:

Originally Posted by Heerven

I have the same problem. I shoot about 3 to 4 shot in full auto and after the gun jam. In semi If I shoot around 6 shots very fast it does the same thing. I was wondering if it's the Craddle velocity reducer the problem. I didn't try it stock since I got it.

Screw the buffer tube endcap as tightly as possible; the gun seems to have problems if you don't.

beanie · July 2nd, 2011, 18:21

What part number is that? I tightened part 52 but it didn't fix the problem. My buffer tube its self (EDIT part 50) doesn't seem to twist either way. Is it a "righty-tighty" thread?

If we are all having the same problem it probably isn't the velo reducer because I haven't installed mine yet. The only inner I installed so far is the RAtech red pistol head. I doubt that has anything to do with it.

Parts list on page 12-15 http://www.kjworks.com.tw/photo/12918985443.pdf

UPDATE: The exact symptoms are the bolt carrier stops working after the first shot and doesn't slide. If a BB does shoot out on the 2nd and 3rd shot it's from the remaining gas in, I think, the receiver. Same problem in semi and full.

UPDATE 2: My gun fires fine if I turn it on either side. I'm starting to think it's probably an issue with friction on the inner parts of my lower receiver/trigger.

Should I buy some silicon spray and give those parts a spray?

P.S. Having a clear lower right now is priceless

Heerven · July 2nd, 2011, 21:29

Should I buy some silicon spray and give those parts a spray?

I put silicone after each games. I clean it and I spray every parts moving. They all move softly. I doubt it' is the problem.
I just notice my buffer tube is sligtly unscrewed. I will try to tighten it....

George Burdell · July 2nd, 2011, 21:49

Quote:

Originally Posted by Heerven

Should I buy some silicon spray and give those parts a spray?

I put silicone after each games. I clean it and I spray every parts moving. They all move softly. I doubt it' is the problem.
I just notice my buffer tube is sligtly unscrewed. I will try to tighten it....

Generally you shouldn't use silicone that come in a spray can.

audi_bhoy · July 2nd, 2011, 21:57

Hey guys, anyone knows of a place in Canada that stocks the RA Tech blue hop up rubber? Mine seems to lose it's accuracy so I'll be upgrading !

beanie · July 2nd, 2011, 22:46

Quote:

Originally Posted by George Burdell

Generally you shouldn't use silicone that come in a spray can.

I'll get the bottle kind from Alberta airsoft in that case. What's the difference?

Saberwing · July 2nd, 2011, 23:05

If your brass buffer tube isn't stuck in your receiver, tighten it a few rotations and make sure the cap is on as tight as possible. It fixed mine

beanie · July 4th, 2011, 04:37

I got my gun working

. I tightened my buffer end cap very tight but it didn't solve it. I took apart my barrel, my robber hop up was slightly misaligned. I realigned it and gave my delta ring a good tighten. (I didnt know you could slide BOTH gas pipe holes in the delta ring.) Now she works good as new.
:duke:

George Burdell · July 4th, 2011, 13:09

Quote:

Originally Posted by beanie

I'll get the bottle kind from Alberta airsoft in that case. What's the difference?

Spray kinds usually are powered by petroleum distillates, which are bad for plastic. I use silicone shock oil from an RC store; it costs very little and is pure silicone oil.

bean · July 4th, 2011, 13:27

Anyone transfer the trigger and selector group from one body to the other on a kjw? If so have any tips. I will be stuck with this task when my body arrives.

Saberwing · July 4th, 2011, 16:53

I've done it. Just take pictures and have an exploded view diagram handy.

Saberwing · July 5th, 2011, 19:02

What size of innertube do we need to buy?

George Burdell · July 5th, 2011, 19:20

Quote:

Originally Posted by Saberwing

What size of innertube do we need to buy?

I just took a random tube from a bike store, and it worked. Mine was about 1.5" in diameter.

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July 2nd, 2011, 10:36	#482
Heerven Trader rating Join Date: Nov 2009 Location: Montréal	I have the same problem. I shoot about 3 to 4 shot in full auto and after the gun jam. In semi If I shoot around 6 shots very fast it does the same thing. I was wondering if it's the Craddle velocity reducer the problem. I didn't try it stock since I got it. __________________ We will find a way.

July 2nd, 2011, 18:21	#484
beanie Trader rating Join Date: Apr 2011	What part number is that? I tightened part 52 but it didn't fix the problem. My buffer tube its self (EDIT part 50) doesn't seem to twist either way. Is it a "righty-tighty" thread? If we are all having the same problem it probably isn't the velo reducer because I haven't installed mine yet. The only inner I installed so far is the RAtech red pistol head. I doubt that has anything to do with it. Parts list on page 12-15 http://www.kjworks.com.tw/photo/12918985443.pdf UPDATE: The exact symptoms are the bolt carrier stops working after the first shot and doesn't slide. If a BB does shoot out on the 2nd and 3rd shot it's from the remaining gas in, I think, the receiver. Same problem in semi and full. UPDATE 2: My gun fires fine if I turn it on either side. I'm starting to think it's probably an issue with friction on the inner parts of my lower receiver/trigger. Should I buy some silicon spray and give those parts a spray? P.S. Having a clear lower right now is priceless Last edited by beanie; July 2nd, 2011 at 21:08..

July 2nd, 2011, 21:29	#485
Heerven Trader rating Join Date: Nov 2009 Location: Montréal	Should I buy some silicon spray and give those parts a spray? I put silicone after each games. I clean it and I spray every parts moving. They all move softly. I doubt it' is the problem. I just notice my buffer tube is sligtly unscrewed. I will try to tighten it.... __________________ We will find a way. Last edited by Heerven; July 2nd, 2011 at 21:36..

July 2nd, 2011, 21:57	#487
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	Hey guys, anyone knows of a place in Canada that stocks the RA Tech blue hop up rubber? Mine seems to lose it's accuracy so I'll be upgrading !

July 2nd, 2011, 23:05	#489
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	If your brass buffer tube isn't stuck in your receiver, tighten it a few rotations and make sure the cap is on as tight as possible. It fixed mine __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon

July 4th, 2011, 04:37	#490
beanie Trader rating Join Date: Apr 2011	I got my gun working . I tightened my buffer end cap very tight but it didn't solve it. I took apart my barrel, my robber hop up was slightly misaligned. I realigned it and gave my delta ring a good tighten. (I didnt know you could slide BOTH gas pipe holes in the delta ring.) Now she works good as new. :duke:

July 4th, 2011, 13:27	#492
bean Administrator Trader rating Join Date: Oct 2004	Anyone transfer the trigger and selector group from one body to the other on a kjw? If so have any tips. I will be stuck with this task when my body arrives.

July 4th, 2011, 16:53	#493
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	I've done it. Just take pictures and have an exploded view diagram handy. __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon

July 5th, 2011, 19:02	#494
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	What size of innertube do we need to buy? __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon

Tanio Koba / KJW M4 GBBR Basic Information and FAQ

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