Ergonomic AR-15 Pistol Grip with Storage CompartmentMounts onto AR-15/ M4/ M16 lower receivers.Ergonomic design to fit comfortably in the Operators hand. Front and rear textured grip surface for comfort and secure gripping surfaces.Storage Compartment can store two each CR123A batteries, spare parts, or emergency survival suppliesReinforced Polymer ConstructionIncludes mounting screw.Dimensions: 4.2H X 2.8L X 1.1WWeight: 2.3 oz.US. PAT. D821529