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Our .300 Blackout Rifle kits deserve their own category. Each one of our .300 Blackout rifle kits comes with the upper assembly pre assembled, and all of the components you need to make your very own firearm. Sourced from American manufacturers, our parts are made right here in the, where quality and American ingenuity are prized above all. Your .300 Blackout Rifle kit is only a few clicks away!