pp-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.
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Aliases: none