The cutaway reveals how moving parts work together to make this complex mechanism function. You have a visual experience in fire, unlock, extract, eject, cock, feed, chamber and lock. You see the interaction of the sears on the trigger, hammer and disconnector. The gas system is revealed and you can see its path from the barrel, into the gas port, through the gas tube, into the bolt carrier key and finally into the expansion chamber. This video takes you inside the AR15 to see how it functions.