Via TankTheTankz -
Airsoft Tech Tips – Troubleshooting: Gun Wont Shoot Semi Automatic
“If your gun shoots full auto when selected to semi auto mode, this may be one of the problems you are facing.
The cut off lever, which is a lever that disengages the shuttle from making a full circuit with your trigger contact, is what allows semi auto fire in an airsoft gun.
If the notch on the shuttle where the cut off lever engages wears off, then the cutoff lever can not function correctly, keeping the semi auto fire from working.
Only solution is replacing the shuttle, which are very inexpensive. As long as you have basic knowledge on how to disassemble a gearbox, this should not be too hard of a fix.”
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