MDT M-LOK Arca Rail Full Forend Length Black. The ORYX full length ARCA rail converts your ORYX Chassis forend to easily attach any of these accessories. The Sportsman Chassis forend has a unique design that increases comfort for shooting offhand and we have optimized this ARCA rail to run the entire length of the bottom. Specifications for MDT M-LOK Arca Rail: Manufacturer: MDT Color: Black Fabric/Material: 6061-T6 Aluminum Quantity: 1 Package Contents: MDT M-LOK Arca Rail MDT 104595-BLK: M-LOK Arca Rail Full Forend Length Black