Bump fire is the method to make a semi-automatic firearm fire like a full auto one by using recoil bump to help pull trigger faster and usually using a Bump Fire Stock. In this video Eric of  Iraqiveteran888  tries it out against the fastest shooter in the world who will rapidly fire on sem-auto but not using Bump Fire. Find out who is faster and who is more accurate... "Team Miculek paid us a visit at the farm and we decided to pit Jerry's trigger finger up against an AR-15 equipped with the Fostech Defend AR-15 bump fire stock. More to come!"