ca m249 issue
 

hey guys so got a weird one today, my saw seems to run and operate fine with no bbs loaded but as soon as i feed any bbs the gun goes into uncontrolled full auto and either drains the mag or until the high cap is no longer winded. i did pull it apart a week ago to lube it up but i put it back together (i thought) as it was originally. what did i miss?????

I remember this happening before.... I think the problem was the microswitch was broken?
The vibration from firing was causing it to stay on or something.
Check for shorts as well just in case.

Checked wiring and was looking bit kinked in one spot. Think the gearbox wasnt sitting 100%right. Got it shooting like it's supposed to (fingers crossed knock on wood ect).

Shitty microswitches.... It could be sticking from arcing if it has no mosfet yet. They're not meant to take the amperage in airsoft guns so they'll eventually weld themselves together any your gun will shoot uncontrollably.