The UTG Ergonomic Ambidextrous Vertical Foregrip mounts on a Picatinny rail and gives your support hand a solid hold on an AR-15 or other railed long gun. Finger grooves position your hand the same way every time. A side slide lets you set up the pressure pad insert for either the left or the right hand, which is useful if you run a weapon light or laser with a tape switch. The end cap holds spare batteries and also controls how tightly the grip mounts. The Picatinny deck slides on and screws down tight. Features: Mounts on Picatinny rails Ergonomic finger grooves Ambidextrous side slide for a pressure pad insert Storage compartment in the end cap About 5 inches long Black Before you buy, check your rail space: the grip needs a clear stretch of Picatinny rail where your support hand naturally falls. On an M-LOK or KeyMod handguard, add a short Picatinny section first. Once mounted, tighten the grip until it doesn't shift on the rail, then check it again after the first range trip. If you're running a pressure pad, route the cable along the rail so it can't snag.