Saw this one at Odin Works, adjustable buffer with 7 different weights. This would make it easier to tune your gun to the ammo or style of shooting you want.

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Description
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 7 weights to customize the weight combination for your personal build.

Technical Specs

  • •Available in AR10, AR15 and 9mm
    •Lite Buffer made from aluminum
    •Heavy Buffer made from stainless steel
    •7 weights included for different weight combinations
    -3 aluminum weights
    -3 stainless steel weights
    -1 tungsten weight