From GHQ in 6mm
"According to Jane's, the Koksan is based on a Chinese Type 59 tank chassis. The 170 mm gun is in an open mount with no superstructure, and is stabilized when firing by two large retractable spades at the rear. The gun has a range that would allow it to strike Seoul from the Korean Demilitarized Zone.
The 170 mm gun itself is a previously unknown type, possibly Russian coastal-defence or ex-naval weapon, though the Soviet/Russian navies are not known to have used this caliber intermediate between their usual 152mm and 230mm calibers, however the German armed forces during World War 2 did use 17 cm caliber howitzers, indicating that this weapon may have been designed to use Soviet-supplied stocks of captured German wartime ammunition. The M-1978 version carried no on-board ammunition supply.
In 1989, a new version of the Koksan appeared, that was designated the M-1989. The main difference was a lengthened chassis that allows 12 rounds of ammunition to be carried. It carries a crew of four; the remaining four personnel needed to man the gun ride in an accompanying ammunition and support vehicle…."
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