An AR-15 buffer extension tube, also known as a receiver extension or buffer tube, is a cylindrical component that houses the buffer and buffer spring, enabling proper cycling and recoil management in AR-15 rifles. It attaches to the lower receiver and supports the stock (fixed or collapsible). The buffer extension tube works with AR-15 lower receivers, buffer springs, buffers, end plates, castle nuts, and stocks. It’s essential for reliable operation, smooth cycling, and customizable stock setups in AR-15 builds.
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