This is a BLACKHAWK Bipod known as the Pivot, model 71BP07BK.
This Blackhawk Sportster Adjustable Pivot Bipod lets you swivel your firearm to either side when shooting on an uneven surface" giving you a level shooting platform. It has no-rust anodized legs with increased spring tension and spring-return telescoping legs- 13.5" to 23". Easily attaches to sling swivel.
Features:
Compact and lightweight design
Pivot eliminates rifle canting on uneven terrain
Unshakable prone and bench shooting
