There is no comparison to full auto fire and pulling a semi auto trigger as fast as possible. Full auto volume of fire is vastly greater. The idea that automatic fire is obsolete is absurd. Short bursts are effective against long range fleeting targets or close range targets that appear before a precise bead can be drawn. Long bursts are usefull for keeping the enemys head down, fixing him in place and robbing him of situational awareness. Full auto fire in 5.56 rifle is quite controllable, paticularly in bursts. 7.62x39 is more difficult but manageable, again in bursts. Full auto 7.62x51 in a rifle is shockingly difficult to control. A 9mm submachine gun gives one the impression of being able to dump a whole mag on target. These are the conclusions I came to after a 3 day live fire weapons familarity excercise intended to provide non infantry troops, artillery in my case, some experience with the broad array of weapons that one might come across in the hands of insurgents or even civilians. The idea being that since a big part of the job over there involved gathering weapons from a wide varietyof sources It might be a good idea to teach us how to recognize, safely handle and clear a wide variety of firearms. Over those 3 days we fired literally dozens of different types of arm across all catagories. It was incredably fun and informative and gave some pretty good insight on the qualities and merits of the worlds tools of battle. The FAL, AK74, and UZI I paticularly liked.