I agree -- I never saw much firsthand utility in burst with either the M16A2s and M4s or with auto on the M4A1 I've been issued down through the years. But, if you're going to add one option or the other to a weapon, the burst capability as implemented on the M16 series is an unnecessary mechanical complication and potential failure point that was only adopted because senior leadership lacked the will to implement meaningful combat marksmanship training.
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