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Before there was the M16 the US ARMY used the AR-15. AR-15 was a semi auto which was a three round burst. It was designed in 1957
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The M16 replaced the M14 rifle that was made in 1959. It's still used for ceromonial reasons.
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It was deployed in jungle warfare for operations in Soth Veitnam.
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The XM148 grenade launcher was designed in 1964 to be mounted on the M16.
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M16 became the United States Army standard service weapon by 1969.
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In 2010 the M16 was phased out of the U.S. Army and is being replaced by the M4 carbine,
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M16 and M4 can use many different sights. Depends on what the misson is.
