On display is Agent Jay's infamous weapon, the Arquillian Arm Cannon, or more commonly known as the "Tri-Barrel." This is a one-of-a-kind replica of the HERO gun used in the final battle of the film to shoot down the flying saucer. This weapon measures over 35 inches long, is fully metal plated, and has brass and aluminum bullets in the magazine. It includes working LED lights; one red in the scope, three blue in the barrels, and one green. The clear side dome houses an alien just like the original prop, and is built with over 50 different parts, including many hand machined components. The gun was built using an original casting left over from filming, and took hundreds upon hundreds of hours of close research and studying of the original props. To my knowledge it is the only one in existence aside from the ICONS replica and the props themselves.
