Spike's Tactical ST-T3 Heavy Buffer, Fits AR-15 Rifles, Black SLA00T3 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-T3 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: 5.5 oz.