Victoptics Rokstad Universal Bipod

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 (6.0 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