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The Beretta A400 is a series of semi-automatic shotguns designed and manufactured by Beretta of Italy. Early model A400 shotguns were used primarily for hunting, yet variants have expanded into use with various disciplines, including sporting clays, trap, skeet, and waterfowl hunting.

History
The Beretta A400 series is a descendent from the A391 series of semi-automatic shotguns, models that were popular from the early to mid-2000s. From the M1923 comes the open slide design, while the alloy frame and locking block barrel, originally from Walther P38, were first used in the M1951. The grip angle and the front sight integrated with the slide were also common to earlier Beretta pistols. What were perhaps the Model 92's two most important advanced design features had first appeared on its immediate predecessor, the 1974 .380 caliber Model 84. These improvements both involved the magazine, which featured direct feed; that is, there was no feed ramp between the magazine and the chamber (a Beretta innovation in pistols). In addition, the magazine was a "double-stacked" design, a feature originally introduced in 1935 on the Browning Hi-Power.