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Invest in this pack of five 80 percent lower receivers and AR-15 jig kit for your next AR-15 DIY build project. If you need more than one lower or are afraid of incorrectly completing the required machining, this five-pack may be the ideal choice for you. These lowers require additional machining for the fire control group, trigger pin, hammer pin, trigger slot, and safety selector hole. The 80 percent lower jig kit includes all necessary parts and instructions to complete the machining on your new lowers. Keep shopping our rifle parts for the other AR-15 parts you’ll need.