A complete lower parts kit is a set of essential components needed to assemble the lower receiver of an AR-15 or AR-10 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 or AR-10 lower receivers and is compatible with upper receivers, buffer tubes, stocks, magazines, and other standard parts, making it ideal for custom builds, repairs, or upgrades.
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