KS-23
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The KS-23 is a Soviet shotgun. Because it uses a rifled barrel, it is officially designated by the Russian military as a carbine. KS stands for Karabin Spetsialniy, "Special Carbine". Wikipedia
Range: 150 m.
Action: Pump action, multilugged rotating bolt
Barrels: 1, with rifled bore
Caliber: 23 mm (0.91 in)
Cartridge: 23×75mmR
Designed: 1971
Feed system: 1+3 shells in underbarrel tube (KS-23); 7 shell detachable box magazine (KS-23K)