Finkelstine is very ignorant of how a gun works. A bump stock uses the recoil to reset the trigger. One pull one round fired. You can also use rubber bands behind the trigger or a belt loop to accomplish the same thing. One round fired one pull of the trigger, a full automatic is the gun fires as long as the trigger is held back. There are people who have fast reflexes and can fire a semi almost as fast as some full autos.I say some because there is no standard of full auto. Its like saying my car goes faster than this or that car. Depends on the car. some like the MG42 12 to 1500 RPM, where as the MP40 and Thompson were much lower cyclical rate. The AA assault shotgun ran at only about 300 RPM. Its easy to pull the trigger faster than that unless you are very arthritic. I wish people who were such idiots would stop acting like they knew a lot about firearms. Fink you don't. You would not know the difference between an MP40 and M60.
https://www.youtube.com/watch?v=v3gf_5MR4tE
https://www.military.com/video/guns/shotguns/aa-12-fully-automatic-shotgun/940106655001