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The cav-arms lowers have been around for years. I personally like them and have handled a rifle that used one. I thought the rifle was a little front heavy or unbalanced, but not bad. Honestly that would be nit picking. I like the fixed stock as well. The complete NFA lowers I have seen had an adjustable stock. The cav-arms lowers were the first to hit the market, NFA is a relatively new company but I have heard nothing but good news from them. For a plinking/fun/range type gun I would not hesitate to use either option. For a work gun I would stick to mil-spec for sure.