This sturdy bipod is perfect for all Weaver and Picatinny rails. The bipod is collapsible and made of durable metal. It fits air rifles with a 20mm Weaver or Picatinny rail. The legs are spring loaded and adjustable length. Fitted with 45mm long 20mm side rails for accessories. Legs fold up when not in use. Raises rifle from 16cm to 22cm.