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The M16's of today fire only in short round bursts; about 3 rounds per trigger pull. These weapons were modified after the Vietnam War, when after action reports were studied; they found that men were firing more rounds and hitting the enemy less. Translation: Approximately 3,000 bullets to kill/wound one enemy soldier in Vietnam. Consequently, the US Army decided "to not waste anymore ammo", and modified the M16's for short round bursts; no more "Rock 'n Roll!" All US Military small arms weapons specify how many rounds PER MINUTE a designated weapon will fire. Since no one (other than the factory) can fire a M16 fully sustained for one minute, because no magazine exists that can hold one minutes worth of .223 ammo (5.56mm); during Vietnam...a standard M16 magazine of 20 rounds could be emptied within 3 seconds, on full rock n roll (fully automatic). And be advised, MOST GI's loaded only 18 rds in their magazines, 20 rounds put too much pressure on the magazine spring...and if not used within a period of time...dust, dirt, moisture, etc. all conspired to cause the spring to fail...creating a jam. IF, during a firefight, and ammo was freely being expended, then a full 20 rounds would be charged into the magazine...because the rifle was going to be emptied within seconds anyway (fired).

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