The UTG Model 4 ergonomic foregrip mounts to a Picatinny rail and folds into five positions, so you can run it vertical, angle it, or fold it flat against the rail. Molded finger grooves give a comfortable, consistent hold. A side slide lets you move a pressure-pad insert to either side for left- or right-handed use. The end cap opens to a storage compartment for spare batteries and also controls the grip mounting. The Picatinny mounting deck slides onto the rail and screws down tight. Features 5-position folding design Ergonomic finger grooves Ambidextrous pressure-pad slide Battery storage compartment in the end cap Picatinny mounting deck Length: 5" Black finish Compatibility Mounts on MIL-STD-1913 Picatinny rails. Under federal law, installing a vertical foregrip on a handgun, including an AR-style pistol, can reclassify it as an Any Other Weapon (AOW). Use it on rifles and verify the rules before installing it on any other firearm.