The M-AD-SF is an in-line mount designed for mounting a Surefire M600/M300 series Scout Light. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems. The M-AD-SF takes up 1.4 inches of picatinny rail space.