The gun as seen in Chuck Versus the Cougars
The Barcode Scanner Gun is a weapon used once by Casey in Chuck Versus the Cougars.
The gun is hidden inside a Buy More barcode scanner, allowing Casey to carry it around without it being noticed. Lifting the top of the scanner reveals the gun inside, and a notch cut in the front of the scanner allows the gun to be fired without lifting the top, thus preserving its hidden status.
It was not seen in use again.