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Ferret makes lowers. Some people get nervous when you suggest that they subject their aluminum AR lower to .50 BMG recoil levels. Thus, they now make solid steel lowers for the Ferret-50. The one in the original post has just such a receiver on it...last i heard (haven't checked them out in a while), ferret only made the upper, and was mainly mating them to DPMS single shot AR15 lowers.