The new Switch MOD 1 Series takes the very best from the Switch Series and custom tailors it to fit the needs of shooters. M-LOK sections up front that gives you flexibility and freedom to run your light solutions. No more need for purchasing additional off-set light mounts. Mount it directly on the rail and go. The 13.8, length is very intentional. This will work with most direct thread suppressors on a 14.5, barrel. The gap will be very minimal and the look - well, amazing. 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.The rail design not only looks great, but is very functional in your hand. The piece adds minimal weight to the rifle and you won't be disappointed!