The mini-gun's much bigger brother. Radar and computer controlled, I rather doubt that you could make it miss.
The time frame for engaging the CIWS on an incoming cruise missile must be tiny indeed with that 2 nautical mile range and the speed of a cruise missile on final approach. Not much time for “pucker factor” to occur on crew there waiting and watching it happen.
..if I am not mistaken,this weapons system uses a variant of the General Electric M61A1 “Vulcan” 20MM rotary cannon...correct me if I am wrong....am very familiar with the M61A1 as used in several Air Force aircraft that I used to work on...