| Wow- Even a picture of the parts.... nice.
That came out at the same time as the "Hellfire", and similar bump-fire kits. Basically, legal ways to get full-auto. California banned them in the mid 90s, and they sorta died out since they lacked any purpose. Some were very sophisticated.
A variation on the triburst above would be something even simplier:
A "rachet" trigger.
Basically, build a second trigger that is attached to a rachet gear. Basically, like the gears on a 10-speed. The gear will advance the wheel, would has an actuator that pushes the trigger.
So, pulling the trigger advances the wheel, releasing does not. SO, then add another "rachet" gear for the reverse stroke. Both driving the same wheel. So that pulling, AND releasing both advance the wheel in the same direction.
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