A .308 80% lower receiver is an unfinished lower receiver for AR-10 rifles chambered in .308 Winchester or 7.62×51 NATO. It requires additional machining to become a functional firearm component. Once completed, it works with AR-10 upper receivers, lower parts kits, buffer tubes, stocks, and magazines. The .308 80% lower receiver allows builders to customize and assemble their own AR-10 rifles, offering compatibility with most standard AR-10 parts for hunting, target shooting, and tactical builds.
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