Trigger and Selector

Noob7_0 · June 28th, 2012, 21:41

Ladies and gentlemen of the forum I have a trigger issue. I am running a G&P M4 with a few upgrades powered by a 7.4v 15C stick Lipo. I purchased the gun used and rewired the gun to a rear battery. It was modified to fire semi only by the previous owner. I believe it was the mod where you cut the selector plate back so that it doesn’t make contact with the cut off lever.

Problem 1
I had to replace a burnt-out trigger switch with this assembly (minus the packaged wiring). While replacing the switch I added an unmodified selector plate. Once reassemble the gun would not fire in auto. Around the same time I ran into an issue where my trigger would be loose when on safe, safe when on semi and semi when on auto. This change was some time ago and I cannot remember if the selector issue happened at the same time.
Answer 1? - I have done some research and this could just be the disc on the selector switch being out of alignment (I will confirm once I break my gun down).

Problem 2
At different intervals of use my trigger goes completely dead. Once this happens it will move when squeezed but the gun doesn’t cycle. If enough pressure is applied there is some friction and then a bump or jerk feeling as the trigger maxes out. After breaking down and reassembling the gear box the gun cycles fine (until failing later). I haven’t been able to determine if the failures are related to number of pulls, rounds fired, trigger pull technique or other factors. I have had the issue with the 7.4v 15c lipo and a front wired 11.1v 20c batteries. The piston does not appear to be locked back and when I open the piston doesn’t fly forward. I was wondering if this is simply semi lock. If it is semi lock I should be able to remedy the issue with a burst in auto correct (assuming problem 1 is fixed).

-Noob

audi_bhoy · June 29th, 2012, 18:46

My guess for your Problem 2 is mostly due to cut-off lever screwed too tight, thus jamming at the disconnection point and preventing the trigger slider to move successfully.

ThunderCactus · June 29th, 2012, 18:52

could also be trigger arcing, loose motor terminals, semi-lock via the sector gear ends on the cutoff lever, the cutoff lever being too tight, possibly the wrong type of selector plate

You should install a simple mosfet if you're going to run any kind of LiPo. The higher amperage of the LiPo may cause excessive heat to build up in your trigger assembly, and it will give you better trigger response.

Noob7_0 · July 3rd, 2012, 19:18

I have a MOSFET installed and my contact are clear. The selector plate is designed for an M4 with a V2.

I broke down the gun and was playing with my selector switch. I didn't have the spring installed on the selector plate. I replaced the plate with the new one and the spring and the selector works fine (I don't know why this didn't work before. It appears that the spring was allowing the selector plate to slide to far forward which was preventing the safety from engaging correctly.

I will take the gun for a spin at my next game and test the Semi-lock theory as I now have F/A to clear the lock. I will also check the screw on my cut off lever.

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June 28th, 2012, 21:41	#1
Noob7_0 Trader rating Join Date: Jun 2011 Location: Cambridge, ON	Trigger and Selector Ladies and gentlemen of the forum I have a trigger issue. I am running a G&P M4 with a few upgrades powered by a 7.4v 15C stick Lipo. I purchased the gun used and rewired the gun to a rear battery. It was modified to fire semi only by the previous owner. I believe it was the mod where you cut the selector plate back so that it doesn’t make contact with the cut off lever. Problem 1 I had to replace a burnt-out trigger switch with this assembly (minus the packaged wiring). While replacing the switch I added an unmodified selector plate. Once reassemble the gun would not fire in auto. Around the same time I ran into an issue where my trigger would be loose when on safe, safe when on semi and semi when on auto. This change was some time ago and I cannot remember if the selector issue happened at the same time. Answer 1? - I have done some research and this could just be the disc on the selector switch being out of alignment (I will confirm once I break my gun down). Problem 2 At different intervals of use my trigger goes completely dead. Once this happens it will move when squeezed but the gun doesn’t cycle. If enough pressure is applied there is some friction and then a bump or jerk feeling as the trigger maxes out. After breaking down and reassembling the gear box the gun cycles fine (until failing later). I haven’t been able to determine if the failures are related to number of pulls, rounds fired, trigger pull technique or other factors. I have had the issue with the 7.4v 15c lipo and a front wired 11.1v 20c batteries. The piston does not appear to be locked back and when I open the piston doesn’t fly forward. I was wondering if this is simply semi lock. If it is semi lock I should be able to remedy the issue with a burst in auto correct (assuming problem 1 is fixed). -Noob

June 29th, 2012, 18:46	#2
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	My guess for your Problem 2 is mostly due to cut-off lever screwed too tight, thus jamming at the disconnection point and preventing the trigger slider to move successfully.

June 29th, 2012, 18:52	#3
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	could also be trigger arcing, loose motor terminals, semi-lock via the sector gear ends on the cutoff lever, the cutoff lever being too tight, possibly the wrong type of selector plate You should install a simple mosfet if you're going to run any kind of LiPo. The higher amperage of the LiPo may cause excessive heat to build up in your trigger assembly, and it will give you better trigger response.

July 3rd, 2012, 19:18	#4
Noob7_0 Trader rating Join Date: Jun 2011 Location: Cambridge, ON	I have a MOSFET installed and my contact are clear. The selector plate is designed for an M4 with a V2. I broke down the gun and was playing with my selector switch. I didn't have the spring installed on the selector plate. I replaced the plate with the new one and the spring and the selector works fine (I don't know why this didn't work before. It appears that the spring was allowing the selector plate to slide to far forward which was preventing the safety from engaging correctly. I will take the gun for a spin at my next game and test the Semi-lock theory as I now have F/A to clear the lock. I will also check the screw on my cut off lever.

Trigger and Selector

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