This papercraft is a boxed Turret, based on the video game Portal 2, the papercraft was created by Evgeniy Pelevin. Turrets serve as one of the main testing obstacles in the Portal series. Armed with almost unlimited ammunition and deadly accuracy, they will attempt to kill test subjects on sight. More information here: Portal – Turret Free Paper Model.
You can download this papercraft model here: Portal 2 - Turret Box Free Papercraft Download