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Completing your 80 percent lower receiver requires specific tools and skills. Invest in this 80 percent lower receiver for sale with an AR-15 jig kit to conveniently complete your build. The jig included with this lower has three interchangeable top plates to mill the fire control group, side plates fitted with drill bushings for proper trigger and hammer pin drilling, and complete instructions to help you complete your build. Additional machining for the trigger slot and safety selector hole will also be required. Keep shopping our rifle parts to find other AR kits for sale.