If you can make a single movement and then remain motionless
I don't think you really understand what I am describing. The device would actually force the trigger along with the shooters finger forward when the bolt comes back for each shot. This way the shooter need only maintain backwards pressure on the trigger while the gun takes care of the moving your finger forward part. Maybe the rate of fire won't be quite FA and your finger might get a bit sore.
I have mostly non-sporting firearms
In NJ, technically speaking, ALL guns are illegal
Also in my state there is such thing as a Class III BB gun :barf:
Happy to say that despite the NJ AWB I still manage to make my guns look scary