Securely attach your rifle to an ARCA mount with the MDT M-LOK ARCA Rail. Arca Swiss adapters have become the standard for attaching rifles to tripods bipods and support gear. Need to attach your MDT Chassis rifle to an ARCA interface? Use our M-LOK ARCA Rail. The MDT M-LOK ARCA Rail is Mil-spec Type II hard-black anodized. Available as a standard flat profile that can adapt to most M-LOK compatible surfaces or as an angled profile that is designed to match the underside profile of the MDT LSS-XL Gen2.