V2 M4A1 - Full auto on semi auto?

KBarlow · April 28th, 2012, 14:37

A local player bought one of the Gameface M4A1s (Classic Army re-brand) from Canadian Tire, and occasionally it fires fully automatic when the selector is on semi-automatic.

How can this be fixed?

tom9109 · April 28th, 2012, 14:46

Go buy the gun again and return the broken one to Canadian Tire.

MaciekA · April 30th, 2012, 08:14

Quote:

Originally Posted by tom9109

Go buy the gun again and return the broken one to Canadian Tire.

Please don't post in the Doctor's Corner section of the forum if you don't have something valuable to contribute. This is not a productive way to kick off your first month on the forum.

How I wish we had a karma system that could perma-silence accounts that are trolls...

To the OP:

When full auto happens on semi, sometimes this means that the trigger assembly's trolley is unable to "snap back" to home position when the sector gear activates the cutoff lever.

How this works:

1) You pull the trigger. The trolley moves forward and makes electrical contact.
2) The sector gear whips around, pulls the piston back, and produces a shot.
3) The cutoff cam on the underside of the sector gear comes around and activates the cutoff lever.
4) The trolley is contacted by the cutoff lever in a manner that enables it to be free of the trigger's hold, and it snaps back to home position.

Any number of things could be wrong here. The trolley could be worn, the cutoff lever could be worn, the trolley's spring could be toast, etc. Also, something could be up with the firing selector.

Another potential cause of automatic fire on semi is overspin, though this tends to happen more on high speed setups with powerful motors and lots of juice (LiPos) and is somewhat rarer.

audi_bhoy · April 30th, 2012, 19:49

Could also be due to the selector plate not being properly aligned, you may try to shoot with the selector between the semi and safe zone. In fact, start from the safe, then try to shoot while moving the selector slightly toward semi at each shooting attempt. If it does full auto as soon as it passed the safe zone, then the problem is stated in the post upper.

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April 28th, 2012, 14:37	#1
KBarlow attention whore wants a custom title. Trader rating Join Date: Jan 2011 Location: Kamloops, BC	V2 M4A1 - Full auto on semi auto? A local player bought one of the Gameface M4A1s (Classic Army re-brand) from Canadian Tire, and occasionally it fires fully automatic when the selector is on semi-automatic. How can this be fixed? __________________ Airsoft Kamloops

April 28th, 2012, 14:46	#2
tom9109 Trader rating Join Date: Apr 2012	Go buy the gun again and return the broken one to Canadian Tire.

April 30th, 2012, 19:49	#4
audi_bhoy Trader rating Join Date: Mar 2009 Location: Trois-Rivières	Could also be due to the selector plate not being properly aligned, you may try to shoot with the selector between the semi and safe zone. In fact, start from the safe, then try to shoot while moving the selector slightly toward semi at each shooting attempt. If it does full auto as soon as it passed the safe zone, then the problem is stated in the post upper.