King Arms M4 firing problems

SurplusIG · February 26th, 2012, 13:18

Hello,

Ive got an M4 by king arms, that Im trying to fix and it has me scratching my head at the moment.

The gun itself feeds perfectly, and handles a high-rate of fire with no miss-feeds. The gun is pretty quiet as it is, there hasnt been any modifications done to the gun. It is shooting around 350 fps also.

The problem it was giving me at first, was it would occasionally stop shooting, I would adjust the motor height just slightly and it would begin firing again. As these seems to have sorted my problem with the gun no longer firing, it now shoots full auto with a slight trigger pull in semi. If I pull the trigger to the end it fires as it normally should in semi auto, but if I pull it back about 80% it fires in full auto. I have checked the cut-off lever from the outside, and it doesnt seem to be jammed, it is springing back into place no problem. I had taken it apart a week ago, and it didnt seem to show any signs of wear, any suggestions on what it may be?

Thanks for any help!

Cpt- Lovegrove · February 26th, 2012, 14:46

could be an issue with ear on the conectors on the
selector plate?

Fuzzy · February 26th, 2012, 15:06

I have the same problem with my KA M4.

SurplusIG · February 26th, 2012, 15:15

The king arms doesn't have any ears for the selector plate... that is if I get what u mean by ears. There are not tabs that make contact with the selector plate. I verified it today and the selector is pretty much brand-new also, no buildup on the metal part that makes contact.

HKGhost · February 26th, 2012, 16:19

The switch assembly trolly could be worn. The edge that the cutoff lever engages. If the edge is rounded, the cutoff lever won't push it up every time on semi. Take a look at that.

Fuzzy · April 14th, 2012, 12:45

Just to update as I know many KA owners with the full auto in semi problem. I replaced the cutoff lever on my KA M4 with a Modify cutoff lever. It is now working as it should.

The tip on the old cutoff lever looked worn so I guess it wasn't engaging properly.

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February 26th, 2012, 13:18	#1
SurplusIG Trader rating Join Date: Feb 2008 Location: Montréal, QC	King Arms M4 firing problems Hello, Ive got an M4 by king arms, that Im trying to fix and it has me scratching my head at the moment. The gun itself feeds perfectly, and handles a high-rate of fire with no miss-feeds. The gun is pretty quiet as it is, there hasnt been any modifications done to the gun. It is shooting around 350 fps also. The problem it was giving me at first, was it would occasionally stop shooting, I would adjust the motor height just slightly and it would begin firing again. As these seems to have sorted my problem with the gun no longer firing, it now shoots full auto with a slight trigger pull in semi. If I pull the trigger to the end it fires as it normally should in semi auto, but if I pull it back about 80% it fires in full auto. I have checked the cut-off lever from the outside, and it doesnt seem to be jammed, it is springing back into place no problem. I had taken it apart a week ago, and it didnt seem to show any signs of wear, any suggestions on what it may be? Thanks for any help!

February 26th, 2012, 14:46	#2
Cpt- Lovegrove Trader rating Join Date: Oct 2011 Location: kingston ontario canada	could be an issue with ear on the conectors on the selector plate? Last edited by Cpt- Lovegrove; February 26th, 2012 at 14:51..

February 26th, 2012, 16:19	#5
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	The switch assembly trolly could be worn. The edge that the cutoff lever engages. If the edge is rounded, the cutoff lever won't push it up every time on semi. Take a look at that. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

February 26th, 2012, 15:06	#3
Fuzzy Trader rating Join Date: May 2011	I have the same problem with my KA M4.

February 26th, 2012, 15:15	#4
SurplusIG Trader rating Join Date: Feb 2008 Location: Montréal, QC	The king arms doesn't have any ears for the selector plate... that is if I get what u mean by ears. There are not tabs that make contact with the selector plate. I verified it today and the selector is pretty much brand-new also, no buildup on the metal part that makes contact.

April 14th, 2012, 12:45	#6
Fuzzy Trader rating Join Date: May 2011	Just to update as I know many KA owners with the full auto in semi problem. I replaced the cutoff lever on my KA M4 with a Modify cutoff lever. It is now working as it should. The tip on the old cutoff lever looked worn so I guess it wasn't engaging properly.

King Arms M4 firing problems

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