This is a Harris Engineering Fixed known as the Bipod, model 1A2BR.
Harris Engineering's 6"-9" Ultra-Light Bench Rest Bipod attaches to a sling swivel stud. It is manufactured using high quality parts to ensure excellent function and sustainable use. The bipod features an anodized matte black finish.
Features:
Legs Extend from 6 to 9
Hard Rubber Leg Caps
Aluminum Bipod with Steel Parts
Attaches to a Sling Swivel Stud