The American Rifle Company Xylo Chassis Forward Weight Kit is designed to add weight to the forend of the chassis, helping to bring about balance and improved recoil management. The half pound kit mounts to the outside of the chassis, while the one pound kit is an internal weight. Either kit includes all necessary mounting hardware. 1/2 lb kitForward External Weight kit.Kit weighs 0.5 pounds including screws and M-LOK nuts (each side is 0.25 pounds).Mounts on outside of chassis fore end.Machined steel, coated black.Uses #10-24, 5/8 inch long flat head screws. Includes 2 weights, 4 screws, 4 M-LOK nuts. 1 lb kitForward Internal Weight kit.Clearance for 1.25" diameter barrel.Kit weighs 1 pound including screws.Mounts inside fore end of chassis under the barrel. Machined steel, coated black.Uses #10-24, 5/8 inch long flat head screws. Includes 1 weight and 4 screws.