There have been some interesting & exciting Airguns designed and made in Russia throughout the 20th century, and this BAIKAL model 651k is definitely one of the more interesting.
BAIKAL MP-651k Co2 Pistol/Carbine Kit
-Caliber: 4.5mm Lead roundball or .177 cal. Pellet
-Rifled Bore suits 4.5 mm lead roundball and approximately 30 rounds can be loaded and fired semi-autimaticly.
-Co2 powered Revolver action
-muzzle velocity: 475 fps
-made in Russia
Carbine Kit includes unique periscope style rear right that is surprisingly effective.