Fortis Manufacturing, Inc. Switch, Handguard, Black, Fits DPMS High Profile 308, 17, Matte 308-SWITCH-M2-17-ML The Fortis SWITCH series is an extremely lightweight" yet robust free float rail system designed for the AR platform. When designing the SWITCH" Fortis wanted a handguard that was easy to install" but also be able to quickly change rails for a variety of mission or competition specific setups. The rail features a brand new patent pending locking mechanism that allows tool-less removal of the rail.