The 6 pre-serial production version, based on a FAP 2220 6x6 truck, was shown to the public for the first time in 1975. Serial production started two years later. The M-77 is mounted on FAP 2026 BDS/A 6x6 truck bed.
The initial model of the M-77, constructed from a FAP 2220 6x6 vehicle, was publicly introduced in 1975. Serial manufacturing started two years later. The M-77 is mounted on a FAP 2026 BDS/A 6x6 truck chassis.