Fun facts, burst mode fucking blows. Tried it at the range with an M4 (none of this newfangled M4A1 shit) for shits and giggles and ended up almost having target practice with the ceiling. Okay, so that's an exaggeration but still, only use burst or automatic fire for target suppression and never to actually kill a fucker. I was disappointed. 

I've also almost melted the barrel of an M240 because my bursts were too long, in a related but unrelated fact.