This paper model is Carmelita Fox's Shock Pistol, a firearm in all four games of the Sly Cooper platform stealth video game series, the papercraft was created by n8s. It was designed with the sole purpose of discharging ions configured into a projectile used to stun personnel.
Carmelita is the only one seen using this weapon. It is very potent, able to take down a criminal as large and durable as Muggshot and destroy inanimate objects as large as a police car, as seen in the first game. She is seen carrying it with her at all times for offensive purposes, flashing it in all directions in search of a possible target to stun; it has an attached flashlight on it that beams white light in opposition to the standard Flashlight Guards' light, which are yellow. [Source: wikia]
You can download this papercraft model here: Sly Cooper - Shock Pistol Free Paper Model Download