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KWA M4A1 Problem


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#1 darkfang68

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Posted 04 February 2009 - 02:37 PM

I have had my KWA M4A1 for about 6 months now and I have had very few problems (other than magazine compatibility issues).  Recently, my gun has failed me several times in the middle of skirmishes.  Before I tell you the exact problem here is a list of what I have in my gun just in case it will help with the diagnosis:

-408mm Prommy
-Systema/Firefly Buckings
-TM Hopup Unit
-Systema Air Nozzle


Here is what I used externally (some of these things may have an effect)

-Madbull JP Long System
-King Arms Stock w/ custom 9.6v 1500 mah Elite battery (M4 is rewired to stock)
-King Arms 80 Round VN Mags
-CA 160 Round Full Metal Mags

Okay now here is exactly what has been happening.  Every once in a while, my gun will completely stop working.  There will be a mag attached and it will have been working a little while ago but it just refuses to shoot.  When I pull the trigger, it comes all the way back but nothing happens.  It is basically reacting like how a gun would react when a battery is not plugged in.  I have tried switching firing modes and fiddling with a few things and nothing works.  I also throughly check all of the wiring and connectors and they are all fine.  

Normally, I might think it was an internal wiring problem, however, the interesting thing is that when I pull out the mag, it starts working fine again.  This is important because it means the problem has something to do with the magazine.  When I put the mag back in after that it will shoot fine, but eventually the same thing will happen all over again.  It seems that it does take a little bit of time before it breaks again so that could be a factor.  

Another important thing to point out is that I have recently been playing in winter conditions.  I have been mostly in temperatures around 30 degrees F.  The absolute coldest was probably only about 15 F.  I don't know if this could have an effect on it either.

Anyone who has ideas on just what this problem could be please let me know.  If this has happened to anyone else also let me know and tell me if you figured out how to fix it.  If you have any more questions about my gun, or any tests you think I should perform in order to more accurately diagnose the problem please tell me.  Thanks.

Edited by darkfang68, 04 February 2009 - 02:54 PM.


#2 brooklyn468

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Posted 04 February 2009 - 05:51 PM

Were you using poor quality bbs? That is the only thing I could think it would be. Or it could be your trigger contacts.

#3 darkfang68

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Posted 04 February 2009 - 07:05 PM

View Postbrooklyn468, on Feb 4 2009, 08:51 PM, said:

Were you using poor quality bbs? That is the only thing I could think it would be. Or it could be your trigger contacts.

I have been using KCS 0.25s so no.  I can't see how bbs would make the gun stop like that anyway.  As for trigger contacts I don't really know what you mean.  Can you elaborate?

#4 Guest_Radix_*

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Posted 04 February 2009 - 09:35 PM

I think it's your rewiring.  It sounds like the magazine is exerting enough pressure to pinch the wires.

#5 darkfang68

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Posted 05 February 2009 - 06:24 AM

View PostRadix, on Feb 5 2009, 12:35 AM, said:

I think it's your rewiring.  It sounds like the magazine is exerting enough pressure to pinch the wires.

Hmm, I had it rewired by a technition what do you suggest I do to see if this is the problem?  The other thing is it's not like when I push the mag in it stops working, it's after the mag has been in for a few minutes.  Little to no pressure is applied during that time so it doesn't really make sense that it would be pinching the wires.

#6 Sgt12Cougar

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Posted 05 February 2009 - 06:41 AM

View Postdarkfang68, on Feb 5 2009, 06:24 AM, said:

Hmm, I had it rewired by a technition what do you suggest I do to see if this is the problem?  The other thing is it's not like when I push the mag in it stops working, it's after the mag has been in for a few minutes.  Little to no pressure is applied during that time so it doesn't really make sense that it would be pinching the wires.

Even if you are not firing, the mag still pushes the BBs up into the hopup unit. The more time, the more pressure, and the more current being stopped in its tracks. So this makes sense.

Check by removing the back receiver pin and lifting the upper outwards. See if there are wires around/on top of the feeding tube and hopup. See if the wire's coverings have been punctured or pinched.

#7 darkfang68

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Posted 06 February 2009 - 04:15 PM

View PostSgt12Cougar, on Feb 5 2009, 09:41 AM, said:

Even if you are not firing, the mag still pushes the BBs up into the hopup unit. The more time, the more pressure, and the more current being stopped in its tracks. So this makes sense.

Check by removing the back receiver pin and lifting the upper outwards. See if there are wires around/on top of the feeding tube and hopup. See if the wire's coverings have been punctured or pinched.

Hmm I just took a look around and I can't find any wires anywhere near the feeding tube or inside of the mag well.

#8 Spiggy

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Posted 06 February 2009 - 04:57 PM

who is your technician?

and by some magic, did he attempt to route the wiring from the front through the receiver and out the back?

#9 darkfang68

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Posted 06 February 2009 - 05:30 PM

View PostSpiggy, on Feb 6 2009, 07:57 PM, said:

who is your technician?

and by some magic, did he attempt to route the wiring from the front through the receiver and out the back?

The wiring is done completely through the back, there are no wires anywhere near the magazine or feeding tube so that is not the problem.

#10 Spiggy

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Posted 07 February 2009 - 12:06 AM

likewise, magazine should not be an overall factor in deciding if the piston should rebuff backwards and cease function.

Does the electronic component still work when it locks back?  In the meanwhile, I'll see if I can replicate this problem on my KM4 and develop a reason and answer.

#11 darkfang68

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Posted 07 February 2009 - 04:44 AM

View PostSpiggy, on Feb 7 2009, 03:06 AM, said:

likewise, magazine should not be an overall factor in deciding if the piston should rebuff backwards and cease function.

Does the electronic component still work when it locks back?  In the meanwhile, I'll see if I can replicate this problem on my KM4 and develop a reason and answer.

I'm not sure what you mean by the electrical component.  When the gun freezes up it reacts like a batteryless gun.  Trigger comes all the way back smoothly but nothing happens.  There are no clicks or attempted motor movement either.

#12 darkfang68

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Posted 07 February 2009 - 05:49 AM

Okay I just did a couple more tests and concluded that the mag is definately influencing the problem.  The other thing is that before when I'd take the mag out it would start working again but now when I take it out it's still broken.  I figure it must be smething to do with the trigger but I don't know much about triggers and trigger contacts




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