The M-1978 “Koksan” is a rather unusual self-propelled gun (SPG) in a number of aspects. Built by the Second Machine Industry Bureau of North Korea, the SPG uses the chassis of the Chinese built and supplied Type 59 main battle tank (itself a Chinese version of the Russian T-54A tank) and mates it with a 170mm gun. The gun itself is a bit of a mystery given the caliber. Some sources say it was derived from a Russian naval gun except that the Russians never used any such caliber. The closest is the 180mm M1931/M1932 pattern naval gun. Other sources say the gun is some form of copy or version of the World War 2 German 170mm Kanone 18 or at least designed to fire captured stocks of 170mm ammunition supplied by Russia (which doesn’t seem completely plausible).
However the North Korean military arrived at the 170mm, the SPG first appeared to Western eyes in a military parade in 1978 held in Koksan County, located in North Hwanghae Province. Since the actual designation for the SPG is not known, Western intelligence analysts gave it the name M-1978 Koksan after the year and place it was first seen. The Koksan was one of the first weapon systems North Korea exported and the only foreign buyer was Iran who purchased a number of them in 1987 and they saw action during the Iran-Iraq War (September 22, 1980 to August 20, 1988), shelling Kuwaiti oil fields using rocket-assisted rounds which made them immune from Iraqi counter-battery fire. During the war, Iraqi forces captured several of the M-1978 and emplaced them as war trophies.
The one in the image was located near the University of Anbar in Ramadi, Anbar, Iraq and is seen being towed away by U.S. Marines in 2008. The M-1978 remains in North Korean service and some sources say surviving Iranian M-1978s also remain in service with Iranian artillery forces.
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