SEOUL, May 8 (UPI) -- North Korea plans to deploy a new heavy artillery system along its border with South Korea this year, state media reported Friday, highlighting Pyongyang's continued focus on conventional firepower capable of threatening the Seoul metropolitan area. North Korean leader Kim Jong Un visited a munitions factory Wednesday to review production of a "new-type 155 mm self-propelled gun-howitzer system," the state-run Korea Central News Agency reported. KCNA said the weapons are