Falconclaw QDA (/RH25/FALCON640v2)For Attaching an PFN640+ Falcon 640+ V2 RH25 RH25 V2 To The Falconclaw QDF QDB Designed And Manufactured In Estonia Falconclaw made a PFN640+ adapter for the flip to side mount. This lets you move the thermal device to the side, so you can use a red dot or LPVO sight without the thermal view. This is useful, for example, when looking through a window since thermals cannot see trough glass. You can also easily move the thermal device from your helmet