You "aim" by the firehose method of following where the stream hits until you reach the target. It is safest to fire till the clip is empty and that is what it take to hit something. Firing those things can cause misfires where the gun fires before the bolt closes and that is very dangerous for the shooter. The experts will tell you still better to fire a semiautomatic with the aim, fire three times while aiming, aim and fire again, and so on. You will get more hits quicker, waste less ammo, and have less risk of misfire or worse. The bump stock the experts say is just a dangerous toy to simulate full automatic firing. Guns can be modified for full automatic fire, but it is illegal for gunsmiths to do that.