The bcm gunfighter 1913 light mount modular - KeyMod is fully ambidextrous: made to mount flush or cantilever off either the left or right side of the rail system. Optional high and low mounting position for the 1913 rail section and fits most common 1913-rail pistol/weapon light systems. Multiple mounting holes for ideal placement, but designed to mount on the 3 or 9 o'clock rail positions. Durable aluminum construction with low-profile and snag-free design..