This is a Harris Engineering Fixed known as the Bipod, model 1A2L.
Harris Engineering's 9"-13" High Ultra-Light Fixed Bipod is manufactured using high quality parts to ensure excellent function and sustainable use. It attaches to a Sling Swivel Stud. The bipod features an anodized matte black finish.
Features:
Legs Extend from 9 to 13
Hard Rubber Leg Caps
Aluminum Bipod with Steel Parts
Attaches to a Sling Swivel Stud