Your Cut-Off lever is a Polymer or Alloy piece that sits between your Trigger and Sector Gear and serves to interrupt/disconnect the trigger once your Gearbox has made a complete cycle. There is a Cam on the Gear which pushes the Cut-Off Lever into the right position to stop the Gearbox cycling when in semi. Any issues pertaining to Semi-Auto function could be a result of a faulty Cut-Off Lever.
Airsoft Electric Parts - Cut-Off Lever
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