Abstract: A display clamp assembly, and a related method, are disclosed for removably attaching a second barrel to a shotgun for display purposes, allowing a retail store (or a buyer) to display the firearm as a combination unit. The extra barrel is attached to the barrel of the fully assembled shotgun. In the preferred embodiment, the display clamp is longitudinally split into two halves. The two halves are mirror images that can be bolted together, along their midsections. When joined, the two halves form collars on opposite ends. One collar is designed to snugly fit around the barrel of an assembled shotgun. The second collar has flared ends that guide the second barrel into the clamp.