Curtis, I would not trust the information published in “Cartridge and Firearm Identification” By Robert E Walker. There are hundred of errors and headstamps that has never been reported before. There is also a Belgian report mentioning that Mzinga Corporation had an obsolete Chinese 7.62x39 production line set up in 1971 that was to be updated in 2004 with a new one provided by New Lachaussée.
There are Mzinga brand 12 ga shotshells loaded with no. 6, BB, SG, LG, and anti riot shot, but I have no idea how these are headstamped. They also have Mzinga brand powder.