A 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, AR-10, and similar rifles. It attaches to the lower receiver and supports the stock (fixed or collapsible). The buffer extension tube works with the lower receiver, buffer, buffer spring, end plate, castle nut, and stock. It’s essential for reliable operation, smooth cycling, and customizable stock setups in AR-platform builds.
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