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AR-15 refers to any of several rifles:

These include:

  • AR-platform firearm, a general category of firearms based on models by Armalite and Colt:
    • Armalite AR-15, a select-fire Armalite rifle manufactured by Armalite,and predecessor of the M16
    • Colt AR-15, sold by Colt Firearms, a line of semiautomatic versions of the military M16 service rifle starting with the SP-1 Sporter model