The TAL-4 Ventilated Ergonomic Vertical Foregrip is designed to provide improved hold on your weapon and more comfortable use of pressure activated devices with the dual sided optional slots. The grip features double side pressure switch housing, water proof anti-rattle storage compartment for two CR123 or AA batteries, quick release mechanism and a secure bolt locking system. It is constructed of lightweight fiberglass reinforced polymer with a quality non-slip design and is compatible with all 1913 Picatinny rails. This model has a black finish. Brand FAB Defense Category Grips Model TL-4 Series Ergonomic Foregrip Color Black Material Polymer Grip Type Ventilated Vertical Grip with Storage Compartment Height 4.60" Mount Type Picatinny Rail