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This model is the 300 Blackout, buds is using the incorrect picture, the picture they are using is of the 7.62x39, but both the model number and upc number confirm this 300BO. Correct picture here https://www.guns.com/firearms/handguns/semi-auto/diamondback-db15-300-blackout-semi-auto-30-1-rounds-10-barrel-new?p=492298

Mason, this gun is chambered for 300 Blackout, as confirmed by the upc number. Have a great day!