An AR-15 lower build kit’s a collection of essential 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, buffer tube, buffer, buffer spring, end plate, and stock (fixed or collapsible). The kit works with AR-15 lower receivers and is compatible with AR-15 upper receivers, magazines, and other standard AR-15 parts, making it ideal for custom builds, repairs, or upgrades.
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