With stock AEGs and GBBs, on long range shots (over 100 feet) it is very difficult to get one shot kills, due to the inherent problems with wind and other causes for bb flight instability. Even for AEGs upgraded to 1.5 joules using heavier bbs, you may still have this problem.
Therefore, if you use short bursts of say 3-5 bbs at a time, the chance that at least one of the burst hits where you were aiming, is greater than the chance that a single aimed shot will hit. Full auto will just waste your ammo.
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