The 1203-21-9 part of Winchester is a 12 gauge pump-action shotgun manufactured by the Winchester Repeating Arms Company. It was introduced in 1966, and is the latest version of the original Winchester Model 12 introduced in 1912. It features a four-round tube magazine, and is available in several finishes and configurations, including a traditional wood-and-blued steel variant and an all synthetic variant. It is suitable for hunting, defense and competition shooting, and is popular among hunters, sport shooters and law enforcement.