Get the most customizable balance with the Gray Ops CNC Hybrid Barrel Weights. Designed for all M-Lok configurations using 3 or more M-LOK slots. FeaturesHard Black Anodize finishIntegral Flush cup2 exterior M-LOK accessory slots per weight (ie. pic rails, thumbrests)Recoil reducing serrated grips along the bottom of each weight that provide an added friction surfaceShaped to be support hand friendly during push/pull/press positional shootingBrass Pair - adds 1.1 pounds (16.8 oz.)Aluminum Pair - adds 0.52 pounds (8.32 oz.)Dimensions - 4.674" x 0.52" x 1.228" (Covers 3 M-Lok slots)Sold in pairsAll M-Lok Hardware included