This is Blackhawks Sportster Bipod Picatinny Rail Adapter. Mount your favorite bipod to any MIL-STD 1913 / AR-15 Picatinny rail with the Blackhawk Sportster Bipod Picatinny Rail Adapter. This Rail Adapter by Blackhawk provides a solid platform for mounting a bipod to any firearm with a Picatinny rail. This Picatinny Rail Adapter for Sportster Shooting Bipods provides maximum versatility for bipod placement options. This Mounting System is incredibly easy to attach and detach.