The TTK is a new pistol from AKBS (АКБС) of Nizhniy Novgorod, Russia. The TTK is a modernized version of the Russian TT pistol and it uses TT magazines. It is chambered in the less-lethal 10х28mm rubber ball round but the company plans on producing a lethal 9x19mm version in the future.
The 10x28mm less lethal round was developed to be as close as possible in shape to a conventional 9x19mm round. This allows 9mm pistols to be converted to a less lethal configuration.
[ Many thanks to Russian Surt for emailing us the info. ]