AIGEN&reg; 6" to 9" Adjustable Spring Return Sniper Hunting Rifle Bipod Sling Swivel Mount with Rail Adapter Made of hardened steel and aluminum.Non-rust black anodized finish Adjustable leg length (with 5 settings) with spring return.Legs can be folded forward or backward. Rubber padded on top to protect forend of gun Leg Height 6 Bipod Sling Swivel Adapter with Weaver Picatinny Rail Mount 20mm, designed for picatinny weaver style ring and easily to attach laser sight or flashlight.