The ERGO UMP Extended cantilever rail allows you to mount your picatinny accessories on your KeyMod handguards in an extended position. The cantilever design allows for mounting a light forward of the handguard placing it in a convenient location to manipulate a push button tail cap as well as placing the light further forward to minimize the shadow cast by the barrel. FeaturesQuick and easy mounting to KeyMod handguards Adds additional mounting options to your firearm Cantilever design for extending handguard accessories