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Question by habben97. Uploaded on December 21, 2012
M16 is military version - semi-auto or full-auto when first introduced in mid 1960's. Later another selector position was included for the 3 shot burst.
AR15 is civilian version that is semi-auto only.
Full auto - continuous fire when trigger is pulled and held. Semi-auto - fires once on each pull of trigger.
M-4 is the current model of the standard 5.56 NATO rifle in use by U.S. forces. Not familiar with the differences in this weapon and the M-16 A1, which was the standard issue weapon when I was in the Army. There were a few variations; Namely the M-16 E1, (different bolt and flash suppressor), the CAR-15,(shorter, folding stock, slightly higher cyclic rate of fire, different fore stock, different flash suppressor), and the M-203, which was simply an M-16 A1 with a 40 mm grenade launcher affixed under the barrel. All of these weapons were equipped with a selector switch, which allowed either semi-auto, or full auto firing.I understand that the current model, the M-4, is only capable of a three round burst on full auto.
The AR 15 is the civilian version of the M-16, with no selector switch, that allows full automatic fire.
the M4 is shorter (ie carbine) version of the m16 both of wich currently offer a 3 round burst mode. the AR (armalite rifle not to be confused with assault rifle) is a civilian variant of either (depending on barrel length and colapsable stock) it offers no three round burst mode only semi auto
M16 is the oldest of the three introduced in the 60's and used by the U.S. Military ever since Vietnam. Usually has a longer barrel a longer barrel than the M4 and has a fixed stock. The M16 usually fires three round burst and semi automatic.
The M4 is a shorter version of the M16. It has a collapsible stock and usually fires fully automatic. Both the M16 and M4 shoot the 5.56 caliber round.
The AR-15 is the civilian version of the M4/M16. It shoots semi automatic (unless you have proper licensing) and has an interchangeable receiver which you can change calibers with if you have a different upper you'd like to use. Like lets say you has a 5.56 receiver. If you wanted to change rounds you would buy a different receiver for say a .300 Blackout and with the push of a few pins you would have a rifle that would be shooting a different caliber.
The AR is the civilian version of the M4 and the M16.
The m-16 has a longer barrel than the m4... I think the M4 has a 14 inch barrel.
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