The Streamlight ProTac Rail Mount 2 is a compact and powerful tac light dedicated for long guns. Mounting to M1913 Picatinny rails with the integrated mount, the ProTac RM2 can be used with either a standard push button tail cap or an included remote switch giving the shooter out of the box flexibility. Features:Bright 22,000 candela beam reaches out to almost 325 yardsIncludes a multi-function tail cap and remote pressure switchStrobe feature (that can be disabled)Powered by (2) CR123A Lithium batteriesDurable aluminum body with anodized finish