The SRS M LOK fore end weight set is as basic as a weight should be, without the added cost. These have M LOK bosses on the backside for a snug lockup on your stock or chassis. Mounting holes are offset for chassis with integral arca rails. Each set comes with 4 m lok fasteners, and two weights. Each weight plus fasteners is 6 oz, and a set is 12 oz. These come Cerakoted black.