Odin Works ABS, Adjustable Buffer, Heavy, For AR15, Comes with 3 Aluminum, 3 Stainless Steel, and 1 Tungsten Weights OS-ABS-AR15-HVY ODIN Works is always looking for new ways to make your build as customizable as possible to fit you" the shooter. This adjustable buffer does just that. Available to fit AR-10" AR-15 and 9mm platforms" each buffer also comes with multiple weights to customize the weight combination for your personal build.