Ledsniper&reg;3-in-1useful 9''-13'' Inches Bipod with 3 Different Adapters Base for Ar-15 Legs extend from 9" to 13" Made of durable, light-weight aluminum Free 3 Adaptors: AR-15 Hand Guard Sling Stud , Universal Barrel Mount, and Picatinny Rail Sling Stud . Quickly attach to or detach from the rifle using existing swivel stud Super Light Weight Weighs under 0.78lb.(only bipod,not included adapters)