Designated with the Stammkennzeichen alphabetic ID code of FL+OZ (later RM+CB) the V2 first flew on 31 October 1939 and was equipped from the outset with the new spinner and cooling fan. It was armed with one Rheinmetall-Borsig7.92 mm (.312 in) MG 17 machine gun and one 13 mm (.51 in) synchronized MG 131 machine gun in each wing root.