Harris Bipod - Harris Bipods clamp to any quick detachable sling swivel stud. They have strong recoil springs to prevent damage to the stock and maintain point of impact. Harris Bipods Legs are adjustable for height. Manufactured with heat treated steel and hard alloys with a black anodized finish. The legs eject by a strong and durable spring action. Quick Detachable Clamp Detachable Sling Swivel Stud 100% Made in the USA Spring Action