This is a NCSTAR Bipod known as the Bipod, model ABPGC2.
This compact size precision grade bipod with notched legs mounts directly onto most sling swivel studs. It includes three adapters for flexible installation. An AR-15 GI handguard adapter" universal rifle barrel mount and Weaver/Picatinny type rail adapter with sling stud
Features:
Black finish
Spring loaded folding action
Rubber pod feet for stability
Compact size model (5.5-8)
Notched legs