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. FeaturesWeights included for different weight combinationsAR-10 comes with 1 aluminum, 1 stainless steel and 1 tungsten weight Note: Improved design does not require use of rubber spacers between weights