Full Metal, with Barrel Adapter, Rubber Feet, With Panning Feature.

Specification
Fit bottom 21mm picatinny and weaver rail
Fit Barrel with adapter (12.5mm to 22mm, 0.5 to 0.9 inch)
Height (from top mount base to foot bottom vertically): 155mm (6 inch) in shortest, 165mm (6.5 inch) in longest
Weight (net): 220g (7.8 ounce)
Easy use and installation
Press down the side button to fold the bipod feet
Release the feet screws to extend the length, and then fasten again
Rubbber Feet avoid slip
High quality aluminum alloy in durable black matte finish