If you need to blow a bunch of ammo for no reason at all just to make it sound cool, you can do the same thing with rubber bands or bungee cords or someone with a beer belly as in “Hey, hold m’beer and watch this!”
You should see the ol trigger finger twitch after my 4th cup of coffee. Who needs bump fire stocks?
The rubber band technique works but it is a technique. Techniques require a certain amount of practice to become proficient.
Slide Fires are pretty much good out of the box.