You place your finger on the front trigger. You then pull through each one until you have a stack of three triggers behind your finger.
Each trigger will fire the rifle one time. But you keep pulling back instead of bringing your finger back froward. Basically you would have a three shot fast semi-auto, close to three round burst. But you still have to pull the trigger three times. Thus its semi yet still works like a burst.
I think it would be much like the cranks that you can put on 10/22s.
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