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5.56 or .223.

Hi Kelly and welcome. This rifle will shoot any grain of 5.56 or .223 ammunition. Just select the bullet type for your shooting needs: https://www.budsgunshop.com/search.php/type/ammo/caliber/10000601-223+remington+5.56+nato --------------- Cheers, stay safe and enjoy!

This model AR-15 loads/shoots both 5.56 & .223 calibers.

Good evening to you!! The American Tactical AR15 Milsport 5.56 NATO, uses either 5.56x45 or .223 Remington. Any grain ammunition ranging from 55-77 will work fine. Twist rate will determine the best round to use. Hope this helps. Have a good rest of your day. 🇺🇸🇺🇸 'merica' 🇺🇸🇺🇸