An AR-10 buffer is a recoil management component designed for AR-10 rifles chambered in .308 Winchester or 7.62×51 NATO. It fits inside the buffer tube and works with the buffer spring to absorb recoil and ensure reliable cycling of the action. The AR-10 buffer works with AR-10 lower receivers, buffer tubes (rifle or carbine length), buffer springs, stocks, and upper receivers. It’s essential for smooth operation, consistent performance, and proper function in AR-10 platform builds.