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Yes Aaron, the barrel is actually stamped 5.56NATO and will fire both 5.56 and .223 just fine out of the 1:8 Twist Rate 16" Barrel. --- https://ruger.com/products/americanRifleRanch/specSheets/6965.html

its a 5.56 rifle that can shoot .223 with no issues specs from ruger Model Number: 6965 Caliber: 5.56 NATO Stock Flat Dark Earth Synthetic Sights None-Scope Rail Installed Barrel Length 16.12" Material Alloy Steel Capacity 5 Magazine Flush-Fit Twist 1:8" RH Finish Matte Black Weight 6.1 lb. Thread Pattern 1/2"-28 Overall Length 36" Length of Pull 13.75" Grooves 6 https://ruger.com/products/americanRifleRanch/specSheets/6965.html