The M-1978 (Koksan) is a 170 mm self-propelled (SP) gun of North Korean design and manufacture. Very little information is available due to the secretive nature of the North Korean Government. The designations M-1978 and Koksan, were given to the type by American military analysts, as they first became aware of it in that year in Koksan, North Korea.
What is known is that it is a 170 mm (~6.69") self-propelled gun of the open turret type. It was first seen publicly during a military parade in 1985. As least one example has been acquired by the United States.