Ba Dou Chong (八斗銃)

Drawing of a Ba Dou Chong, from 'Wu Bei Zhi (《武備志》)'.

Ba Dou Chong (八斗銃, lit. 'Eight bucket gun') was an unusual weapon that consisted of two double-ended double barrelled handgonnes joined together with a pivot, allowing its user to discharge eight shots in quick succession. While Ba Dou Chong was marginally more useful than the likes of Zhi Heng Chong (直橫銃), it was still an incredibly awkward weapon.