The M16A2 was made to a Marine Corp request for modifications to the M16A1 involving the rear sight, handguards, heavier barrel etc, it became the standard arm in the early 80's (USMC)& in 1986 (US Army) & is still in service today. The M16A2 used a 3rd "burst" fire action, the M16A3 was basically an A2 w/full auto fire, the M16A4 uses a "flat top" upper receiver (similiar to the M4 carbine). Besides these variants the military has ordered conversion kits, consisting of complete A2 uppers/barrels, lower parts kits, stock groups/handguards & converted many A1's into A2 configuration. This may be the reason a lg number of M16/M16A1 style uppers came on the market within the last 2 years.
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