BAR Offset Side Rail Attachments. This side rail is designed to mount on the side of the BAR rails or the VZ58 rail system. The rail is constructed of hard coat aluminum and is attached with 3 included socket head screws and Drops the Rail down front the side of the BAR Night Vision Rail. Rail is constructed of T6 6061 hard coated black anodized aluminum. The rail is offset from the mounting area for additional hand clearance. Comes with mounting screws. Rail sticks out from mount 7/8 and is 4" in length and weighs 2.5 ounces.