The A407 100mm anti-tank gun M1977 is a Romanian rifled 100-mm anti-tank gun which serves as the main towed anti-tank gun of the Romanian Land Forces from 1975 until present. Versions of the M1977 gun were installed on main battle tanks (TR-77 and TR-85) and ship turrets on river monitors.
== History == The A407 100mm anti-tank gun was the first artillery piece designed in Romania after World War II. The first variant of the gun, the M1975 (M stands for Model) had a semi-automatic horizontal sliding wedge type breech lock. The second variant, M1977, had a more practical vertical sliding wedge breech block. The M1977 can be also used as a field gun at brigade level, as it has a maximum range of 20.6 kilometers. After 1992, the M1977 anti-tank guns were modernized with improved optical sights. The gun can be towed with the DAC 665T truck and has a maximum road speed of 60 km/h on road and 30 km/h off-road.
== Variants == M1975 - used the horizontal sliding wedge breech lock. M1977 - used the vertical sliding wedge breech lock. M2002 - modernized version of M1977 with a FCS TAT-100. Adaptations:
A 308 - tank gun used for TR-77 and TR-85 main battle tanks. A 430 - 100 mm gun used for ship turrets.
== Operators == Iraq Israel − One was delivered in 1993. North Korea Romania − 208 M1977 towed anti-tank guns in 2010.
== See also == T-12 antitank gun D-10 tank gun 100 mm field gun M1944 (BS-3)
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== External links == Arsenal Reşiţa website Archived 2020-03-09 at the Wayback Machine Video Video of the M1977 firing on YouTube