Literally any company that makes slightly above average shit. DD barrels are middle of the road in longevity and accuracy. Their components like their bcg and bolt are standard and are nothing special. Their magazines are overpriced and weaker than pmags. Their rails are nice and I have used them in the past, but that's the only thing I can sing their praise on. Maybe some fag likes their shitty stock with the rubber inlay, but what else do they do that other companies in the same price range or less do?