Quote Originally Posted by Ruiner
Eh, yes and no. AR comes from Armalite and not Assault Rifle. The M4 Carbine is a family of firearms tracing its lineage back to earlier carbine M16, all based on the original AR-15 made by ArmaLite. The AR-15 was first made in both auto and semi auto configs. Then, the M-16 came out (about the same exact thing, really). The M4 Carbine is just a shorter AR-15/M-16.

Honestly, there's really not much difference between the guns. They all look the same and most of the parts can be used between them. Most M16s and M4s are full auto/semi/3rnd burst. Most AR-15s are semi auto.

the only versions of the M4 and M16 that come in full auto were the M4A1 and the M16A1, after that they only had semi auto and three round burst.