Work on NORA project began in 1975, and in May 1980 first prototype of NORA-A was sent to Technical Testing Center. In 1984 development was finished and NORA-A designated as M-84 NORA was accepted by Yugoslav People's Army. In 1989 M-84 powder chamber was redesigned and mass of gun was reduced with and new designation was adopted as M-84B1. The M-84B2 version is fitted with a pneumatic loader which is operational at all gun elevations, with the capacity of over 30 work cycles from one standard compressed air tank mounted on one of the trails.