This adapter is made exclusively for the Infiray/iRay USA Rico Micro thermal optic. The pictail adapter adds a dovetail mount to the Mirco, as well as adding a picatinny rail that can be used in conjunction with the American Defense Mfg. MQD mount made specifically for the Micro.
If you want to mount the Micro on a rifle you'll need both this item and the ADM MQD (OL-IRAY-AC36) Mount.