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sorry it is a 223 only and should not be used with the higher pressure 556 ammo specs Specifications and Features: .223 Remington 22" barrel 1:9 twist 4 round detachable box magazine Accutrigger Three position safety Nikon 3-9x40 scope with BDC reticle Length: 41.5" Weight: 7.25 lbs Black synthetic stock Matte black metal finish

Anthony, it is not recommended since the barrel is stamped .223. 5.56 is a similar but higher pressure round military round and for safety and warranty concerns, it is not recommended. Cheers!