Yankee Hill Machine Co MLOK Continuous Rail Section, 2.75, 5 Slot, Black YHM-5400A YHM's M-Lok Picatinny Adapter allows you to mount Picatinny accessories to your M-Lok handguard. The Continuous M-Lok Rail System or C.M.R.S. can be mounted end-to-end to create a continuous Picatinny rail. Made from 6061-T6 aluminum that is hardcoat anodized and feature stainless M-Lok screws and nuts.