This AR vertical Picatinny foregrip with storage compartment mounts onto 1913 MIL-STD Picatinny rail handguards. The Vertical Foregrip features picatinny rail and a storage compartment with a twist on/off storage door for batteries and cleaning supplies. This AR vertical grip is designed to be held by your support hand for better stability and control of your weapon under rapid fire. The side picatinny rail let you attach accessories directly to the grip such as laser sight or tactical flashlight. The grip is made of high-quality polymers. All mounting hardware included. 5.4”L X 1.7”W X 1.5”D. 4.6 oz.