▁on ▁the ▁new ▁T 2 4 ▁ch ass is ▁( a ▁prototype ▁of ▁the ▁M 2 4 ▁Ch aff ee ). ▁The ▁T 6 5 E 1 ▁had ▁the ▁same ▁overall ▁layout ▁as ▁the ▁T 6 5 ▁G MC ▁– ▁gun ▁tur ret ▁at ▁rear ▁with ▁the ▁engines ▁in ▁the ▁middle ▁of ▁the ▁ch ass is ▁– ▁with ▁a ▁few ▁minor ▁twe aks ▁( including ▁an ▁angular ▁gun ▁shield ▁instead ▁of ▁a ▁straight ▁one ). ▁ ▁M 1 9 ▁and ▁M 1 9 A 1 ▁ ▁The ▁T 6 5 E 1 ▁was ▁accepted ▁into ▁service ▁as ▁the ▁M 1 9 ▁Gun ▁Motor ▁Car riage ▁in ▁May ▁ 1 9 4 4 ▁with ▁an ▁order ▁for ▁ 9 0 4 ▁production ▁models , ▁which ▁was ▁sent ▁to ▁Cad illa c . ▁ ▁Some ▁ 3 0 0 ▁were ▁built ▁by ▁M asse y - F erg us on ▁( then ▁M asse y - H arr is ) ▁in ▁Canada . ▁Production ▁did ▁not ▁start ▁until ▁August ▁of ▁that ▁year , ▁and ▁only ▁ 2 8 5 ▁were ▁produced ▁by ▁the ▁end ▁of ▁the ▁war . ▁The ▁M 1 9 A 1 ▁had ▁an ▁auxili ary ▁engine ▁and ▁generator ▁to ▁operate ▁the ▁ 4 0   mm ▁guns ▁when ▁the ▁main ▁engine ▁was ▁shut ▁down , ▁and ▁fi xt ures ▁for ▁carrying ▁two ▁spare ▁gun ▁bar rel s . ▁ ▁Service ▁history ▁ ▁The ▁full ▁order ▁was ▁not ▁completed ▁as ▁the ▁requirements ▁for ▁anti - air craft ▁weapons ▁had ▁changed ▁and ▁ch ass