The Bernardelli B4 is an Italian-American shotgun.
The B4 was created as an an answer to the United States Joint Service Small Arms Program, which called for a new semi-automatic shotgun and sought to standardize weapons across all U.S. Military branches. The weapon performed successfully, due to it using a box magazine instead of an underbarrel tube magazine, and was made of very high quality and durable materials. Unfortunately, the weapon was banned from importation into the United States, along with other potential box magazine-fed shotguns on the civilian market, such as the Beretta M3P and Franchi SPAS-15.
The weapon operates similarly to a SPAS-15. The weapon has semi-automatic capabilities to have a higher "second hit" probability if the user were to miss the first shot.
Pump-action only variant.