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Ricardo, This firearm will handle the pressures of the 5.56 round as well as the .223 round. Barrel is marked 5.56/.223. BUD's descriptions are sometimes not perfect when entered on description page.

its fine with both specs here DIAMONDBACK DB15 5.56 16" 30RD MLOK BLK SKU: 815875014478 Diamondback, DB-15, Semi-automatic Rifle, 556NATO, 16" Barrel, Black Finish, 1 Magazine, 30Rd, 12" MLOK Rail UPC Code: 815875014478 Manufacturer: Diamondback Manufacturer Part #: DB15MZB Model: DB15MZB Action: Semi-automatic Type: AR Caliber: 556NATO Barrel Length: 16" Finish/Color: Black Grips/Stock: N/A Accessories: 1 Mag Capacity: 30Rd Description: 12" MLOK Rail

Ricardo, this rifle's barrel is stamped 5.56NATO from the factory Sir. It will safely fire both 5.56 and .223 ammunition no issue.