I stumbled over some news and websites that report some 120mm howitzers/guns, both on tracked and wheeled chassis. tracked aka "PLZ-05A" http://defence-blog.com/army/china-showcased-its-new-type-05a-self-propelled-mortar-system.html http://www.military-today.com/artillery/plz_05a.htm Wheeled aka PLL-05 http://www.globalsecurity.org/military/world/china/pll-05.htm http://www.military-today.com/artillery/pll_05.htm There are some information out there on the PLL-05, but virtually nothing on the PLZ-05A. Probably because thats obviously the wrong designation for it. The two websites above are the only things I could find with google, and they are riddled with inaccuracies, so its hard to filter out the usefull ijnformations. I am especially interested in why China would build both 122mm (PLZ-07) and 120mm guns. Seems redundant to me. Does anyone have more infos on these ?