RioRand 9''-15'' Adjustable Tactical Bipod Tactical Pivot Bipod (Sling Swivel Stud Mount) Ajustable Spring Return (Best Hunting Bipod) For Shooting Airsoft Rifle Gun Sniper Material: Hardened and aluminum; Leg Height: 9" (retracted) 15" (fully extended) Light weight : 400g Durable with new design high quality that you can quickly attaches to sling swivel stud. Durable with new design high quality that you can quickly attaches to sling swivel stud. Bipod model allows shooter to compensate for ground that is unlevel by up to 20 degrees. A Rail Adapter is required for mounting on a Picatinny / weaver rail.