A Quick Draw is an enemy who has two mini-guns on each side that rolls on 3 wheels. This unit is not the one with the giant shield, that unit does not have guns. You must down one then mind jack it then use its guns to get 10 kills. This machine has a lot of health and a good amount of firepower so you may get 1 kill each time you use one. Again you can hack one and let a friend stand there as you shoot him.
The levels a Quick Draw is on are: 02-2 and 03-0. There are others but these are the best.