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If you’re building or buying an AR-platform firearm, understanding the lower receiver is crucial. It affects how the firearm works, how it’s classified legally, and how much flexibility you have for customization. Whether you are starting a build or evaluating components, the lower receiver is the foundation that everything else relies on. What the Lower Receiver Does The lower receiver is the part of an AR-style firearm that contains the fire control group. This includes the trigger …