Chinoook 6" to 9" Adjustable Spring Return Sniper Hunting Rifle Bipod -Sling Swivel Mount Heavy duty - made of hardened steel and aluminum Non-rust black anodized finish Adjustable leg length (with 5 settings) with spring return Compact and light weight Easy sling swivel attachment. A Rail Adapter is required for mounting on a Picatinny / weaver rail.