11. Koksan Guns
When North Korea military sets their collective mind to it, they can produce some formidable weapons. The Koksan, so named by the U.S. Military, is a 170 mm self-propelled gun, mounted to a vehicle made by ripping off a Chinese tank design. The Koksan is nothing to scoff at. From the north side of the demilitarized zone, North Korea can strike Seoul with one of these bad boys.