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There are a few out there for high end builds like Turnbull. Forged then CNC'd 6061, then 7075 then billet are some upgrades from the original. I have, at one point, owned all of them aluminums, Steel and Polymer. Sold the Steel, have a Cav Arms and GWACs still in polymer. But most of mine at 7075 with a few billet.
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