A sighting device for a firearm accessory includes a first coupling member, a second coupling member, and a multiple rail arrangement. The first coupling member is supported on an upper half portion of the firearm accessory. The second coupling member is supported on a lower half portion of the firearm accessory, and includes an elongated coupling slot formed thereon to detachably engage with a firearm rail of the firearm. The multiple rail arrangement includes a plurality of mounting rails formed on the first coupling member and the second coupling member, wherein the mounting rails allow the firearm accessory to be mounted onto at least one additional firearm accessory so as to eliminate a need to individually attach the additional firearm accessory to the firearm.