Tanio Koba / KJW M4 GBBR Basic Information and FAQ

George Burdell · June 5th, 2011, 11:46

Quote:

Originally Posted by Saberwing

I'm going to try and get a KJW CQBR Barrel, but if I can't I will go for either a Daniel Defense or G&P. Does anybody know what the proper length outer barrel to use is? 10.5in or 11.5in?

I think it's a 10.3" barrel.

George Burdell · June 5th, 2011, 11:48

Quote:

Originally Posted by Heerven

Hi,
since a couple weeks, I have a weird problem in full auto. When I shoot full auto after 3 to 4 shots, most of the time, the rate of fire decrease like there is no more gaz and finally jam at the 6th to 7th shot. I have to cock the gun and restart to shoot in semi, that is work perfect. The gaz is still there because, I can empty the mag with no problem in semi.
I tried for a test to empty a mag in full auto. And the rate of fire and power were decreasing after the 5th to 6th (same) but could go back to the normal rate and slow down again after the next 4 shot...Same cycle until the end.
It wasn't do that when I first bought it.
Note, I use a Craddle velocity reducer.
It's like the gaz pressure is unstable.
Do you have an idea of this problem?

I experienced some weird problems when I accidentally loosened the buffer tube end cap slightly; try tightening that.

audi_bhoy · June 5th, 2011, 11:50

It sounds like cool down, but I've never heard of KJW doing so since they have a large gas capacity...

George Burdell · June 6th, 2011, 15:03

I just got the Falcon hop up rubber and tight bore; the hop up actually works now

The hop up seems to still be a bit inconsistent, sometimes it will overhop or underhop a bit, but it is nowhere near as inconsistent as the stock hop up.The tight bore has seemed to shrink the groupings pretty significantly, they are half as big at 10m.

Saberwing · June 8th, 2011, 11:46

Daniel Defense Rail installed, now just got to get a 10.3" DD Barrel from Jeff and a QD silencer:

beanie · June 9th, 2011, 22:38

Nice pics saberwing. How is the wobble on the DD RAS?

What is the fastest the KJW M4 has been chronographed at (.25g BB)? My best is 471 so far.

Saberwing · June 9th, 2011, 22:53

Wobble of the RAS? none. It's rock solid on there. I made sure I torqued it hard. There's is still slight barrel flex but less then there's was with my G&P KAC RAS

beanie · June 10th, 2011, 01:59

Got my G16 grip in the mail, had to mod it a little bit because ehobby only had AEG versions. I was pleasantly surprised how well it matched my Umarex CP99 co2 .177 pellet pistol.

beanie · June 11th, 2011, 10:25

I'm working on some of my final mods, but need advice.
How do I take apart the hop-up to replace the inner barrel? It appears I slide off the copper ring and then remove the hop up in two pieces but the copper ring won't budge. Help?

George Burdell · June 11th, 2011, 11:29

Quote:

Originally Posted by beanie

I'm working on some of my final mods, but need advice.
How do I take apart the hop-up to replace the inner barrel? It appears I slide off the copper ring and then remove the hop up in two pieces but the copper ring won't budge. Help?

Get a small flat head screwdriver, place it between the ring and the hop up chamber, then tap it lightly with something that is not a hammer. Don't hit it too hard, it might damage the chamber.

beanie · June 11th, 2011, 14:36

Tried that for a few minutes couldn't get it to work. I got it off by wrapping a rubber coated cable around it and twisted it off.

beanie · June 11th, 2011, 16:35

G&P 10.5inch Commando Steel Outer Barrel for M4 AEG (modded), RA-Tech 6.03mm Stainless Steel Tight-bore Inner Barrel, STAR Flash Hider, Madbull Noveske Rifleworks Gas Block (modded gas tube hole)

Saberwing · June 12th, 2011, 01:05

Looking good Beanie, but you gotta get some paint on that lower

Gamed it at a private CQB field today. Had a rubber break, but replaced it mid game and kept going the rest of the day. loving the DD RAS, now just can't wait for 10.3" Barrel, QD Silencer, BUIS, and gas block.

By the way, anybody else experience this? Whenever I fire, everybody ducks including team mates.

audi_bhoy · June 12th, 2011, 23:44

Yeah I've been having the same target disappearing issue, even when my hop-up was fucked and would send BBs straight up even when I had it to zero hehe !!

Olisharpeye · June 14th, 2011, 21:26

I've recently just completed the TDC Hop up modification. But It's still having the same accuracy problems. I was just wondering when you disassemble the hop up unit from the upper receiver. Does the spring stay between the two bumps? One is on that metal block that base itself on the upper receiver and the other bump is on the hop up arm.

*Edit* I am so embarrassed right now, I've been fielding this gun with the hop up arm upside down X.x *Shoots self*

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June 8th, 2011, 11:46	#455
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	Daniel Defense Rail installed, now just got to get a 10.3" DD Barrel from Jeff and a QD silencer: __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon

June 9th, 2011, 22:53	#457
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	Wobble of the RAS? none. It's rock solid on there. I made sure I torqued it hard. There's is still slight barrel flex but less then there's was with my G&P KAC RAS __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon Last edited by Saberwing; June 10th, 2011 at 08:52..

June 11th, 2011, 14:36	#461
beanie Trader rating Join Date: Apr 2011	Tried that for a few minutes couldn't get it to work. I got it off by wrapping a rubber coated cable around it and twisted it off. Last edited by beanie; June 11th, 2011 at 17:48..

June 5th, 2011, 11:50	#453
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	It sounds like cool down, but I've never heard of KJW doing so since they have a large gas capacity...

June 6th, 2011, 15:03	#454
George Burdell Trader rating Join Date: May 2011 Location: Toronto	I just got the Falcon hop up rubber and tight bore; the hop up actually works now The hop up seems to still be a bit inconsistent, sometimes it will overhop or underhop a bit, but it is nowhere near as inconsistent as the stock hop up.The tight bore has seemed to shrink the groupings pretty significantly, they are half as big at 10m.

June 9th, 2011, 22:38	#456
beanie Trader rating Join Date: Apr 2011	Nice pics saberwing. How is the wobble on the DD RAS? What is the fastest the KJW M4 has been chronographed at (.25g BB)? My best is 471 so far.

June 10th, 2011, 01:59	#458
beanie Trader rating Join Date: Apr 2011	Got my G16 grip in the mail, had to mod it a little bit because ehobby only had AEG versions. I was pleasantly surprised how well it matched my Umarex CP99 co2 .177 pellet pistol.

June 11th, 2011, 10:25	#459
beanie Trader rating Join Date: Apr 2011	I'm working on some of my final mods, but need advice. How do I take apart the hop-up to replace the inner barrel? It appears I slide off the copper ring and then remove the hop up in two pieces but the copper ring won't budge. Help?

June 11th, 2011, 16:35	#462
beanie Trader rating Join Date: Apr 2011	G&P 10.5inch Commando Steel Outer Barrel for M4 AEG (modded), RA-Tech 6.03mm Stainless Steel Tight-bore Inner Barrel, STAR Flash Hider, Madbull Noveske Rifleworks Gas Block (modded gas tube hole) Last edited by beanie; June 11th, 2011 at 17:00..

June 12th, 2011, 01:05	#463
Saberwing Trader rating Join Date: Mar 2007 Location: London, ON	Looking good Beanie, but you gotta get some paint on that lower Gamed it at a private CQB field today. Had a rubber break, but replaced it mid game and kept going the rest of the day. loving the DD RAS, now just can't wait for 10.3" Barrel, QD Silencer, BUIS, and gas block. By the way, anybody else experience this? Whenever I fire, everybody ducks including team mates. __________________ KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon Last edited by Saberwing; June 12th, 2011 at 23:27..

June 12th, 2011, 23:44	#464
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	Yeah I've been having the same target disappearing issue, even when my hop-up was fucked and would send BBs straight up even when I had it to zero hehe !!

June 14th, 2011, 21:26	#465
Olisharpeye Trader rating Join Date: Feb 2009 Location: Kitchener	I've recently just completed the TDC Hop up modification. But It's still having the same accuracy problems. I was just wondering when you disassemble the hop up unit from the upper receiver. Does the spring stay between the two bumps? One is on that metal block that base itself on the upper receiver and the other bump is on the hop up arm. Edit I am so embarrassed right now, I've been fielding this gun with the hop up arm upside down X.x Shoots self __________________ Bolt Action Level 2 Certified Last edited by Olisharpeye; June 14th, 2011 at 23:36..

Tanio Koba / KJW M4 GBBR Basic Information and FAQ

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