Vector Optics SCBPW Universal Bipod (Weaver/Picatinny Rail Mount)

Fits 21mm picatinny and weaver rails
Height (from top mount base to foot bottom vertically):
225mm (8.8 inch) in shortest
270mm (10.6 inch) in longest
Weight (net): 275g (9.7 ounce)
Easy to use and install
Press down the side buttons to fold out the bipod feet
Release the feet screws to extend the length, and then fasten again 
Rubber Feet avoid slipping
High quality aluminum alloy in durable black matte finish
Designed for real firearm use too