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.223 or 5.56 ammo

Hi timothy and welcome. No, it is rated for 5.56 so can shoot both .223/5.56. Kel-tec details here : https://www.keltecweapons.com/firearm/rifles/su16/ ------ Cheers and stay safe!

Hi Tim, from the owners manual - "The SU-16 rifle is designed and chambered for the 5.56mm NATO (.223 Remington) cartridge. The type of ammunition is also stated on the right side of the receiver." Stay safe & have a great day!