Which innovative military product, first mass-produced during the American Civil War, revolutionized warfare by allowing soldiers to fire multiple rounds without reloading?

Throughout history, military success has often hinged on product innovation and adoption. New weapons, technologies, and equipment have repeatedly transformed warfare, creating advantages for early adopters and reshaping tactics. This poll tests your knowledge about a particularly significant innovation that dramatically changed military dynamics during a famous historical conflict, altering the course of history through superior product development.

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The Spencer repeating rifle, which could fire seven rounds in 30 seconds
The Gatling gun, which was the first fully automatic machine gun
The Minié ball bullet, which improved accuracy and lethality of muskets
The Colt Navy revolver, which was the first widely used multi-shot handgun