The Tiger Rock Inc. MBA2-KIT308 AR-10 MBA-2 Luth-AR Rifle Buffer Tube Kit delivers unmatched quality and reliability for serious shooting enthusiasts. Featuring a robust 10" fixed position buffer tube made from durable T6-6061 aluminum, this kit ensures longevity and peak performance on your AR-10 platform. With a heavy 5.4 oz buffer assembly and an 11.5" pre-loaded steel spring, you can expect optimal function and stability. 10" Fixed Position Buffer Tube Heavy 5.4 oz Buffer Assembly 11.5" Pre-Loaded Steel Spring Compatible with A1/A2 Fixed Buttstocks Includes Integrated Castle Nut and Lock Ring Upgrade your rifle with this comprehensive kit and experience superior performance today.