Harris S-25 Bipod 12-25 Inch (Swivel Base)
Series S bipods rotate to either side for instant levelling on uneven ground. This one adjusts from 12 - 25 inches. It has smooth, 3-piece legs, and attaches to the sling swivel by a screw-up clamp. Manufactured from heat treated and hardened alloys.
I used it once on a trip to Scotland.