The Streamlight STL 89017 ProTac Rail Mount HP-X Pro delivers exceptional performance for demanding environments, offering a powerful 105,000 candela for extreme beam reach that penetrates smoke, fog, and photonic barriers. This versatile light features a Jack-Cap tail cap switch that provides operational redundancy, enabling seamless switching between push-button operation and remote pressure switch functionality. Designed for long guns with MIL-STD-1913 rails, the ProTac Rail Mount HP-X Pro also offers an optional M-LOK mount to accommodate a variety of tactical configurations. Constructed from durable 6000 series machined aircraft aluminum with an anodized finish, it stands up to rugged outdoor use and features a gasket-sealed glass lens with an IPX7 waterproof rating for immersion up to 1 meter for 30 minutes. With a beam distance of 648 meters and a maximum output of 800 lumens, this light ensures visibility in the darkest environments while remaining lightweight at 6.40 ounces and compact at 5.63 inches in length. The multi-fuel capability allows operation on a rechargeable Streamlight SL-B26 battery pack or two CR123A lithium batteries, providing flexible, extended-use options for hunters, law enforcement, and tactical professionals alike.