Fortis Manufacturing, Inc. Black, Fits AR-15, 15.3MLOK 556-SWITCH-M1-153-ML The Fortis SWITCH series is an extremely lightweight" yet robust free float rail system designed for the AR platform. When designing the SWITCH" we 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.