Quote Originally Posted by def90 View Post
On the serious side it?s just the abbreviation for Armalite, not Armalite Rifle.. Armalite made other firearms that weren?t rifles that still used the AR prefix.

AR-9 shotgun
AR-13 multi barrel gun for aircraft
AR-17 shotgun
AR-22 blank firing device for mk19 grenade launcher
AR-23 sub caliber training device for mk19 grenade launcher
AR-24 9mm pistol