The popular Glock Standard Frames has a proprietary rail that prevents standard rail-mounted accessories from fitting it. This CTL Custom was designed specifically for the Glock Standard Frames by the expert engineers at Viridian. Viridian has collaborative relationships with the major gun manufacturers allowing for the ultimate custom fits on the custom C Series. The CTL is corner stone within Viridians C Series line of high-performance rechargeable accessories, it offers an array of industry-leading features that ensure optimal performance and tactical advantage. These tactical lights get their power from a high-performance internal rechargeable polymer lithium battery. SAFECharge is the new, gotta-have, ultra convenient rechargeable power bank system that is ready when you are. The magnetic connector makes it a snap. NOTE: This device will not fit any other firearms.