Color: Black National Stock Number (NSN 1010-01-536-4707) TangoDown LLC's new vertical grip features the next generation of life-saving utility and strength. Designed to fit any Mil-Std 1913 rail, this product can withstand punishing abuse mounted on weapon systems from the M4 Carbine to the Mk. 48 SAW. Vertical fore grips are often called upon to mount pressure switches for lasers and tactical lights. In the past, Velcro or adhesive tape were less- than satisfactory methods of securing the pressure switch to the grip. Heat, rapid movement and heavy gloves often rip the switch loose with obvious consequences. The Tango grip features a novel pocket that appears when needed, to positively mount pressure switches without movement or damage. Just remove the threaded end cap, slide out the filler panel and place inside the grip for storage. Just replace the panel with your pressure switch and replace the end cap to lock the switch in place. Quick and easy, allowing fast mount and dismount of lights and lasers. The Tango grip has internal storage to spare, for spare weapon bolt assemblies, extra batteries, medical supplies or any other mission specific items. The threaded end cap has a large diameter O-ring to protect its contents to 66 feet. The TangoDown vertical grip model BGV-MK46 comes with full instructions and wire cables. Please note: TangoDown vertical grips may be very tight on YHM or MI rails and may have to be fitted for installation.