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First Lever Action Shotgun
Browning developed his Model 1887 Lever-Action Repeating Shotgun and sold his design to the Winchester Repeating Arms company. -
First Pump Action
In 1892, a fellow by the name of Spencer introduced the pump shotgun to American hunters. -
First Semi-auto Shotgun
The Browning Auto-5 was the first mass-produced semi-automatic shotgun. Designed by John Browning in 1898 and patented in 1900.