An AR-15 lower parts kit is a set of essential small components needed to complete the lower receiver of an AR-15 rifle. It typically includes the trigger, hammer, springs, pins, safety selector, magazine catch, bolt catch, takedown pins, and sometimes a pistol grip. The kit works with AR-15 lower receivers and is compatible with AR-15 upper receivers, buffer tubes, stocks, magazines, and other standard AR-15 components, making it crucial for building, repairing, or upgrading AR-15 rifles.
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