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Austin, I believe this rifles barrel size is .750 but, I would confirm this directly with DiamondBack Customer Care Call Center Toll Free: 1 (877) 997-6774 - Monday thru Friday 8 AM to 4:30 PM (EST).

I would contact DiamondBack Customer Care Call Center Toll Free: 1 (877) 997-6774 - Monday thru Friday 8 AM to 4:30 PM (EST).

Austin, Diamondbacks DB series ARs have their medium barrels. They are .750 at the gas block. Diamondback has many different contours on barrels, but the DB models are .750 at gas block.