▁were ▁upgrad ed ▁to ▁W Z ▁ 5 0 1 B ▁level ), ▁which ▁are ▁mostly ▁used ▁by ▁arm oured ▁units ▁station ed ▁in ▁northern ▁main land ▁China . ▁The ▁modern ization ▁of ▁W Z ▁ 5 0 1 ▁IF V s ▁developed ▁by ▁the ▁Chinese ▁N OR IN CO ▁concern ▁are ▁known , ▁including ▁the ▁W Z ▁ 5 0 1 M ▁with ▁a ▁new ▁one - man ▁tur ret ▁armed ▁with ▁the ▁Russian ▁ 2 A 7 2 ▁ 3 0   mm ▁aut oc annon ▁and ▁the ▁" M aly ut ka - 2 " ▁AT GM . ▁The ▁P LA ▁Marine ▁Corps ▁in ▁southern ▁Gu ang d ong ▁province , ▁is ▁equ ipped ▁with ▁the ▁special ▁variant ▁designated ▁the ▁Type ▁ 8 6 B ▁developed ▁by ▁N OR IN CO ▁which ▁has ▁been ▁adapted ▁for ▁crossing ▁sea ▁water ▁obst acles . ▁ ▁A ▁co - operation ▁project ▁between ▁the ▁Chinese ▁N OR IN CO ▁and ▁the ▁US ▁F MC ▁companies ▁in ▁the ▁ 1 9 8 0 s ▁gave ▁birth ▁to ▁a ▁prototype ▁export ▁variant ▁designated ▁the ▁N F V - 1 . ▁The ▁prototype ▁of ▁the ▁N F V - 1 ▁IF V ▁was ▁shown ▁public ly ▁in ▁November ▁ 1 9 8 6 . ▁The ▁vehicle ▁has ▁the ▁" Sh ar ps ho oter " ▁one - man ▁tur ret ▁armed ▁with ▁the ▁stabil ized ▁ 2 5   mm ▁M 2 4 2 ▁Bush master ▁aut oc annon ▁and ▁ 7 . 6 2   mm