This figure is a reissue of Marvel Universe (Series 3) #021 Steve Rogers, Captain America but with a silver gun instead of a black one.
*Steve Rogers was a scrawny kid from Brooklyn until Abraham Erskine's experimental serum transformed him into a super-soldier. Determined to fight for freedom, Steve created the identity of Captain America and became a champion of liberty unlike any the world has ever known. The Avengers need a leader, and that's where your Steve Rogers figure comes in! This super-soldier wears the vintage World War II costume, and he has the strength to take on the bad guys with Earth's Mightiest Heroes at his side. Pose his arms for an attack for the ultimate Avengers combat! Includes figure. *Source: hasbro.com