▁to ▁historian ▁Mike ▁Green , ▁the ▁t anks ▁were ▁never ▁issued ▁to ▁combat ▁units . ▁ ▁Design ▁Besides ▁the ▁machine ▁gun ▁mounted ▁co ax ial ly ▁to ▁the ▁main ▁gun , ▁there ▁were ▁three ▁. 3 0 ▁cal . ▁machine ▁guns ▁in ▁the ▁h ull . ▁One ▁was ▁mounted ▁in ▁a ▁ball ▁mount ▁in ▁front ▁of ▁the ▁bow ▁gun ner . ▁The ▁other ▁two ▁were ▁mounted ▁in ▁fixed ▁spons on ▁mount s . ▁These ▁machine ▁guns ▁were ▁fired ▁by ▁the ▁driver ; ▁they ▁were ▁aim ed ▁by ▁pointing ▁the ▁entire ▁tank ▁at ▁the ▁desired ▁target . ▁Another ▁. 3 0 ▁cal ▁machine ▁gun ▁was ▁normally ▁mounted ▁on ▁the ▁top ▁of ▁the ▁tur ret ▁for ▁anti - air craft ▁defense . ▁ ▁The ▁ 3 7   mm ▁M 5 ▁gun ▁had ▁a ▁manually ▁operated ▁b ree ch block . ▁The ▁tank ▁commander ▁double d ▁as ▁loader , ▁like ▁many ▁other ▁t anks ▁of ▁the ▁time . ▁There ▁was ▁no ▁tur ret ▁basket ▁in ▁the ▁M 2 A 4 ▁light ▁tank ; ▁the ▁commander ▁stood ▁on ▁the ▁right ▁side , ▁while ▁the ▁gun ner ▁stood ▁on ▁the ▁left ▁side . ▁The ▁commander ▁turned ▁the ▁tur ret ▁onto ▁the ▁general ▁direction ▁of ▁target . ▁The ▁gun ner ▁would ▁then ▁bring ▁the ▁target ▁into ▁the ▁M 5 ▁teles cop ic ▁sight . ▁The ▁M 2 0 ▁combination ▁mount ▁had ▁ 2 0 ° ▁of ▁traverse ; ▁this ▁could ▁either ▁be ▁by ▁a ▁hand w heel ▁driving ▁the ▁ra ck ▁and ▁pin ion ▁traverse ▁g ear ▁mechanism