This is a Truglo Bipod known as the TAC POD, model TG8901S.
This TAC POD adjustable bipod mounts to a sling swivel stud or a picatinny rail. It is lightweight and compact with quick deployment. It has a spring-assisted design and it includes a sling stud adapter that can be used without bipod for additional sling mounting options. Adjusts 6"-9".
Features:
Black finish
Fits sling swivel stud or picatinny rail
Comes with adaptor
Fixed
Adjusts 6-9