Spike's Tactical ST-T1 Heavy Buffer, With Tungsten, Fits AR-15 Rifles, Black SLA00T1 Looking for a heavy buffer to replace your standard carbine buffer? Well" Spike's came up with something that offers the HIGHEST performance at a reasonable price. The ST-T1 buffer is one of the softest shooting" smoothest" and quietest buffers on the market; not to mention it looks awesome! It is 100 Percent maintenance free! Weight: 3 oz.