The M1991 multiple launch rocket system was developed in the North Korea. This artillery system was first observed by US intelligence in 1991. It's designation was originally allocated by the US Department of Defense. Number in the designation indicates the year that it was first observed. The M1991 is one of the most potent artillery system in the North Korean army inventory. It is produced as required. As far as it is known this system has not been exported.

   A number of these artillery systems are located north of the demilitarized zone and are targeted towards South Korea.

   The M1991 MLRS is a more powerful version of the older M1985. It has 22 launching tubes and fires the same 240-mm rockets. It has various warhead capabilities, including HE-FRAG, smoke, incendiary and chemical. A standard HE-FRAG warhead weights 90 kg and contains 45 kg of explosives. A claimed maximum range of fire is 43 km.

   The M1991 is mounted on a 6x6 truck chassis. This truck is understood to be based on an imported design. Some sources suggest that these are Romanian DAC trucks. The launcher pack can also be adapted to suit any suitable heavy military truck.

   A battery of the M1991 consists of five launching vehicles. Three batteries form a multiple launch artillery battalion. Launching vehicle is supported by a reloading vehicle, which carries reload rockets and is fitted with a crane. Reloading would normally be carried out well away from the firing position, to avoid counter-battery fire.