An AR-15 jig guides drill bits and end mills to the correct positions when finishing an 80% lower receiver. It clamps the lower in place and provides pre-drilled holes to align cutting tools for the fire control group pocket, trigger slot, and safety selector hole. Builders use it with a drill press or milling machine to complete the receiver. Jigs fit specific lower receiver brands and styles, so builders confirm compatibility before purchasing. Using one keeps cuts accurate and helps ensure the finished lower functions correctly.

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