The thing I noted about this UXO projo is that it appears to be what in the USFA we'd call a "RAP round" - a rocket-assisted projectile. Given that the stated distance from the DPRK shore to Yeonpyeongdo is about 12km and the maximum range of a standard 122mm projo is about 15km, it sounds as if the KPA is looking for a smidgen more stand-off for their little game of bitchslap.No deep observation here, just noted in passing.
