An AR-15 rear takedown pin is a small steel pin that secures the upper and lower receivers at the rear of the rifle, allowing them to pivot open for maintenance or disassembly. It works with AR-15 lower receivers, upper receivers, takedown pin detents, detent springs, and lower parts kits. The rear takedown pin is essential for easy assembly, takedown, and secure fit of the receivers in all standard AR-15 builds and repairs.
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