Ernő Lovass & N.R. Jenzen-Jones The 2B9M Vasilek (‘Cornflower’) is a muzzle or breech-loading, long recoil-operated automatic smoothbore medium mortar. It is a modernised, air-cooled version of the 2B9 water-cooled mortar, itself derived from the earlier F-82 automatic mortar. Development of the 2B9 began in the late 1960s, with the Soviet army adopting the weapon in 1970. The modernised 2B29M