This paper model is a full size That Gun, a unique weapon in the video game Fallout: New Vegas, the paper model created by Vitold Vessone. The size of finished modelis about 186 (H) x 59 (W) x 330 (D) mm.
That Gun is a heavily modified, pared down .223 pistol, successor to the same weapon from Fallout and Fallout 2. It weighs a hefty 5 pounds and has a motorized cylinder and crane for quicker shooting and reloading than a typical revolver. The green light on the left side turns yellow while reloading, then turns green and makes a ringing noise once the weapon has reloaded. Until the advent of the add-on Gun Runners' Arsenal, it had the unique capability of using dedicated armor piercingrounds, something that no other pistol in the game was capable of. That Gun is also the least expensive named rare gun that is available for purchase in Fallout: New Vegas.
Along with Lucky, it has the second highest potential critical hit chance multiplier (x2.5) of all one-handed non-energy guns, right after the silenced .22 pistol. [Source: wikia]