Based on the Picatinny Rail Adapter by Vik Olliver.
Clamps on the body of the 6mm BB Airsoft version of the ASG / KWC Cobray Ingram M11 CO2 NBB.
Ideal to attach red dot sights or whatever else you want.
Designed so that the original iron sights can still be used as a backup.
The author hasn't provided the model origin yet.