Primos Trigger Stick Bipod made of Steel with Black & Gray Finish, QD Swivel Stud Attachment Type & Medium Height (Clam Package) Ultra-light Primos Trigger Stick Gun Mounted Bi Pods are lightning quick, and quality manufactured with heat-treated steel and hard alloys. These bipods are quick-detachable and clamp to the sling swivel stud of bolt action rifles with a conventional stock design, or a picatinny rail on a modern sporting firearm. Carrying your weapon with a sling or shooting off-hand is not impeded. Like every Trigger Stick, the Primos Gun Mounted bi pods adjust to your desired height with just one hand and the pull of a trigger. The Primos Trigger Stick Gun Mounted bipods are the ultimate solution for making your shot accurate no matter where you are.