SureFire RM45 Off-Set Rail Mount for a Scout Light (Thumbscrew-Clamp Models Only), Tan Attaches thumbscrew-clamp-equipped Scout Lights to MIL-STD-1913 (Picatinny) rail forends--positioning the light in the off-set position--for lower profile and reduced snag potential Lightweight, durable construction-aerospace aluminum coated with Mil-Spec Type III hard anodizing Fits Thumbscrew-Clamp Models Only Backed by SureFire's No-Hassle Guarantee Compatible with models: M300, M300V, M600U, M600V, M600P, M600AA