Vertical grip for RIS Rails. Spring loaded bipod extends at the push of a button which can be used to either give the user stability when shooting or keeps the rifle off the ground. Bipod legs and stowed again by folding the together and pushing them back up into the grip Product Details: Construction: Polymer Weight: 221g Features: Very heavy duty spring bipod ejecting bipod Legs can be positioned at different heights once ejected Very strong ejection spring Grooved for added grip  Package Includes: Bipod Vertical Grip for 20mm Rails - Black