The Beretta Px4 Storm is a semi-automatic pistol intended for personal defense and law enforcement use. It is available in full size, Compact, and Subcompact versions. The Px4 uses a trigger and safety system similar to the Beretta 92 and the Beretta 8000 series, though it is distinguished from its predecessors by its light-weight polymer construction with steel inserts, standard Picatinny rail, and swappable grip backstraps. The full size and Compact versions use the same short-recoil, rotating barrel action as the Beretta 8000 series, whereas the Subcompact uses the tilt barrel system.

Fabbrica d'Armi Pietro Beretta is a privately held Italian firearms manufacturing company operating in several countries. Its firearms are used worldwide for a variety of civilian, law enforcement, and military purposes. Sporting arms account for three-quarters of sales; Beretta is also known for marketing shooting clothes and accessories. Founded in the 16th century, Beretta is the oldest active manufacturer in the world. Its inaugural product, in 1526, was the arquebus barrel; by all accounts Beretta-made barrels equipped the Venetian fleet at the Battle of Lepanto in 1571. Beretta has supplied weapons for every major European war since 1650.