Today I have two hunting rifle bipods from Twod, they are almost identical in design. The difference is size. The one pictured on the left of the screen is adjustable from 9-13 inches. The bipod on the right of the screen adjusts from 6-9 inches.
The smaller version is cheaper. It is $15.99 on Amazon, with its big brother costing $19.99.
Both bipods attach to a sling swivel stud, something I have a hard time saying fast. If your rifle does not have an attatched stud, but it has a rail the rifle bipods each come with a rail mount adapter.
Both are constructed of black anodized aluminum and are pretty sturdy. I have had several of these type bipods over the years and for the price they are hard to beat.
Here are some additional features
Quickly attach to or detach from the rifle using existing swivel stud.
Foldable arms with spring tension control.
Comes with the mount adapter.
Adjustable leg length: 5 settings for different length, the bipod is ready to meet your needs.
Made of hardened steel and aluminum, non-rust black anodized finish, the rifle bipod is duty and light weight.
Legs are spring loaded and extend and retract with a small push of a button.
Rubber padded on top to protect forend of gun