The ST-T2 buffer is one of the softest shooting, smoothest, and quietest buffers on the market. It is aluminum with a crushed tungsten Mil-Spec bumper. This model has a black anodzied finish.Looking for a heavy buffer to replace your standard carbine buffer. Well, we came up with something that offers the highest performance at a reasonable price. The ST-T2 buffer is one of the softest shooting, smoothest, and quietest buffers on the market, not to mention it looks awesome. It is 100% maintenance free. Features: Crushed tungsten, Mil-Spec bumper