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How to Mill Out An AR-15 80% Lower ReceiverHow to Mill Out an AR-15 80% Lower Receiver: A Detailed GuideThe AR-15 is one of the most popular firearms in the United States due to its versatility, modularity, and the ease with which enthusiasts can customize it. One of the key components of this firearm is the lower receiver. For those interested in building their own AR-15 from scratch, milling out an 80% lower receiver is a crucial step. This guide will provide a comprehensive, step-by-step pro …