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yes you can its actually a 5.56 see **** Armalite M-15 Light Tactical Carbine AR-15 Semi Auto Rifle .223 Rem/5.56 NATO 16" Barrel 30 Rounds Aluminum Key-Mod Handguard Collapsible Stock Black Finish M15LTC16 Specifications and Features: Armalite M15 Light Tactical Carbine M15LTC16 AR15 Semi Automatic Rifle ********5.56mm NATO (accepts .223 Remington) 16" Chrome lined chrome-moly vanadium barrel Threaded 1/2x28 with flash suppressor 1:7" Twist rate A2 style pistol grip Collapsible stock Carbine length gas system 10" Aluminum KeyMod hand guard Full length picatinny top rail Forged 7075-T6 aluminum flattop upper receiver Forged 7075-T6 aluminum lower receiver Single stage trigger 30 round magazine Overall length 32" Collapsed 35.3" Extended" Overall weight 6 lbs Limited lifetime manufacturers warranty Made in the USA Black

Hi Dan, Yes this chambers 5.56 as well as .223.