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Yi, no, it is barrel stamped .223 Remington and 5.56NATO should not be fired. Cheers and stay safe!

The barrel is stamped 223 which is a lower pressure round then the similar sized 556, you can shoot 223 out of a 556 but shouldn't shoot 556 out of a 223 the increased pressure can cause damage to the gun, or even injure the shooter. There is a wide variety of 223 ammo out there for different purposes though, just run a Google search "best 223 ammo for-----" hunting, home defense, range shooting, varmints etc.