Also known as: PP-90, PP-92, PP-90M, ПП-90
The PP-90 is an open-bolt, 9×18mm Makarov folding Submachine Gun designed by KBP Instrument Design Bureau in 1990s. It takes a rectangular shape in folded form. The only fire mode is fully automatic.
The PP-90M is a slightly modernized variant, and PP-92 is the 9×19mm Parabellum one.