Williams began using System 11B during the production of "Big Guns", so this game can have either an 11A or 11B system board. Mark Ritchie stated at the Chicago Expo 2012 that the backbox was made larger by 4 inches because artist Python Anghelo needed more room to build the castle! He also said the King was to be Steve Ritchie, who did the voice for that role. Pictured in this listing is a comparison of two images showing playfields below the flippers where two triangles, normally gray in color, are yellow. We received these two images anonymously and do not know the cabinet serial numbers from either (or playfield serial numbers, if they have any). Shown on each playfield is an identical part number with suffix 'SP' indicating that the supplier was Sun Process. Production Run Records for Big Guns: Production Start Date: Sep-28-1987 Production End Date: Dec-21-1987 Production Run Quantity: 5250 First ship date: Sep-29-1987 Last ship date: Apr-29-1988