Abstract: A solid, single-pour synthetic weapon stock comprises polyurethane and an equal amount by volume of a spacing material of silica-alumina ceramic microspheres blended into the polyurethane. For additional strength, a U-shaped bar having spaced apart bores is disposed within the weapon stock. A process for manufacturing the polyurethane weapon stock, comprises the steps of blending polyurethane with the spacing material to form a polyurethane reactant, placing the U-shaped bar into a mold having a void of a shape of the weapon stock, pouring the polyurethane reactant into the void and allowing the polyurethane reactant to react to form a polyurethane object having the shape of the void, curing the polyurethane object and removing the polyurethane object from the mold.