The WAC-21[3][4] (also called Type 88[5] and WA021[1][2]) is a Chinese 155 mm howitzer produced by Norinco,[3][2] It was developed with the assistance of Gerald Bull.
By the late-1970s, Gerald Bull was aiding the development of longer-ranged 155 mm caliber guns[3] based on the Space Research Corporation's (SRC) GC-45 howitzer.
[4] An early result was the GHN-45 howitzer from Voest-Alpine's subsidiary, Noricum.
[3][4][1] Over four years starting From the early-1980s, SRC helped China[3] develop and produce the WAC-21 gun,[3][4] which was a "virtual clone" of the GHN-45,[1] and ammunition.
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