research mosfets and you'll find tons of info.
Mechanical in that you might not have to figure out how to make a linkage that goes back from the grip, around magwell and connect to the trigger mech already there.
If it's not going to be a select fire weapon...then don't sweat the linkage thing at all, just provide power to the motor when you want it to shoot.
That other rifle looks like ass...sorry.
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