An AR-15 80% lower is a partially machined lower receiver for AR-15 rifles, not yet classified as a firearm. It requires additional milling to become functional. Once completed, it works with AR-15 upper receivers, lower parts kits, buffer tubes, stocks, magazines, and other standard AR-15 components. The AR-15 80% lower allows DIY builders to customize and assemble their own rifles, offering compatibility for hunting, target shooting, and tactical builds.
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