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Hi Anthony and welcome. No, 5.56 barrel is 7 inch and 300BLK Barrel is 10 inches. Cheers and stay safe!

no the 5.56 barrel is 7 inches and the 300 blackout is 10 inches see ***** Brand Diamondback Model DB15 Caliber 5.56 / 300BLK Gun Platform AR-15 Style Capacity 30rd Barrel Finish Black Nitride Barrel Material 4150CRMOV Twist 1:8" RH Grips Flat Dark Earth Magpul ******Barrel Length 7" / 10" Trigger Mil-Spec Stock Finish Flat Dark Earth SKU 171643 UPC 810035752931 MPN DB195AK061

Hi Anthony, the 5.56 barrel is 7" and the 300 Blackout barrel is 10" Stay safe & have a great day!