The Streamlight ProTac Rail Mount 1L-X Pro Weapon Light with CR123A Battery combines compact size, strong throw, and flexible controls for tactical rifle-light applications. Designed for short-barreled rifles, carbines, and submachine guns, it delivers 500 lumens, 18,000 candela, and a 268 m beam, and the Jack-Cap tail cap allows push-button or remote pressure switch operation. Picatinny and M-LOK mounting, BOROFLOAT glass, and an IP67-rated waterproof build round out a durable long-gun light.