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This 80 percent lower receiver is machined to mil-spec tolerances. The mag well on this 80 percent lower receiver is full broached for the perfect fit every time. Building your own AR-15? This 80 percent lower receiver is a great choice for any DIY gunsmith looking to build his or her own AR-15. 80 percent machined to mil-spec tolerances. You get to go hands-on with this lower, completing the machining for the fire control group, trigger pin, hammer pin, trigger slot, and safety selector hole yourself. We hope you enjoy your build. Keep shopping rifle parts and AR-15 parts here to find an AR-15 jig kit and everything else you will need to complete your AR-15.