PP-19 "Bizon" is a Russian AK-based submachine gun of unusual design. It was designed in the early 1990s by Viktor Kalashnikov (son of AK-47 designer Mikhail Kalashnikov) at Izhevsk Mechanical Works. It features a high capacity cylindrical helical magazine similar to earlier American Calico design, but placed as a foregrip, thus making the weapon very compact and easy to handle.

The weapon can be chambered in three calibers - 9x18 Makarov, 9x19 Parabellum, or 7.62x25 Tokarev. The magazine holds 64 (9mm versions) or 45 rounds (7.62mm version).

Bizon submachine guns are in limited use with Russian security and law enforcement forces.

See also:

• list of weapons
• AK-47
• Calico SMG