The 9 mm PPK-20 submachine gun, based on the Vityaz-SN, differs from its predecessor by its compact size, lower weight, optional quick-detachable sound and flash suppressor, folding telescopic polymer buttstock, ergonomic pistol grip and ambidextrous fire selector switch.
The main cartridge for this submachine gun is the 7N21 high-power armor-piercing round, but the PPK-20 can also use all types of 9x19 rounds.
The use of a pistol round allowed use a simple and reliable blowback action.
Scopes can be mounted on a Picatinny rail on the dust cover, and other accessories can be attached on the Picatinny rails on the top and bottom of the handguard, as well as the M-LOK interface on the sides.
