▁did ▁not ▁progress ▁through ▁the ▁prototype ▁stage . ▁O thers ▁include ▁an ▁experimental ▁fitting ▁of ▁a ▁French ▁Drag ar ▁tur ret ▁and ▁a ▁non - am ph ib ious ▁B WP - 4 0 , ▁the ▁Swedish ▁CV ▁ 9 0 4 0 ▁tur ret ▁mounted ▁on ▁a ▁B WP - 1 ▁h ull , ▁a ▁joint ▁development ▁of ▁H uta ▁St al owa ▁W ola ▁and ▁B of ors ▁and ▁the ▁B WP - 9 5 ▁( see ▁the ▁Poland ▁section ▁of ▁the ▁B MP - 1 ▁variants ▁article ▁for ▁details ). ▁The ▁aim ▁of ▁such ▁modern ization ▁is ▁to ▁increase ▁the ▁fire power ▁of ▁the ▁B WP - 1 ▁in ▁accord ance ▁with ▁the ▁modern ▁standards ▁of ▁the ▁Polish ▁Army ▁and ▁NAT O . ▁The ▁pres ervation ▁of ▁all ▁available ▁army ▁infrastr ucture ▁( AF V ▁repair ▁bases , ▁training ▁schools ) ▁is ▁also ▁important . ▁The ▁main ▁problem ▁with ▁modern ized ▁variants ▁of ▁the ▁B WP - 1 ▁is ▁a ▁significant ▁increase ▁in ▁the ▁weight ▁of ▁the ▁vehicle ▁which ▁can ▁cause ▁an ▁over load ▁of ▁the ▁engine , ▁the ▁transmission ▁and ▁the ▁susp ension . ▁ ▁Y om ▁K ipp ur ▁War ▁The ▁B MP - 1 ▁was ▁tested ▁in ▁combat ▁for ▁the ▁first ▁time ▁on ▁ 8 ▁October ▁ 1 9 7 3 , ▁during ▁the ▁Y om ▁K ipp ur ▁War . ▁Egypt ▁had ▁received ▁its ▁first ▁batch ▁of ▁ 8 0 ▁brand ▁new ▁IF V s ▁in ▁July ▁and ▁August ▁ 1 9 7 3 . ▁A