A sighting device for a firearm accessory includes a first coupling member, a second coupling member, and a multiple rail arrangement. The electromagnetic interference shielding layer is a plated metal layer in contact with the package body, and the plated metal layer is connected to a ground trace extending on the upper surface of the substrate. The second segment having an outside wall angled greater than a corresponding first segment outside wall in relation to an inner wall of the channel. The perimeter wall is joined to the base and extends from it in a generally perpendicular fashion. Energy savings are achieved through the oil pump.