▁D unk irk , ▁the ▁equipment ▁needs ▁of ▁the ▁British ▁were ▁ac ute . ▁Though ▁not ▁entirely ▁satisfied ▁with ▁the ▁design , ▁they ▁ordered ▁the ▁M 3 ▁in ▁large ▁numbers . ▁British ▁exper ts ▁had ▁viewed ▁the ▁mock - up ▁in ▁ 1 9 4 0 ▁and ▁identified ▁features ▁that ▁they ▁considered ▁fla ws ▁– ▁the ▁high ▁profile , ▁the ▁h ull ▁mounted ▁main ▁gun , ▁the ▁lack ▁of ▁a ▁radio ▁in ▁the ▁tur ret ▁( though ▁the ▁tank ▁did ▁have ▁a ▁radio ▁down ▁in ▁the ▁h ull ), ▁the ▁riv et ed ▁arm or ▁pl ating ▁( wh ose ▁riv ets ▁t ended ▁to ▁pop ▁off ▁inside ▁the ▁interior ▁in ▁a ▁dead ly ▁r ico ch et ▁when ▁the ▁tank ▁was ▁hit ▁by ▁a ▁non - pen etr ating ▁round ), ▁the ▁smooth ▁track ▁design , ▁ins u fficient ▁arm or ▁pl ating ▁and ▁lack ▁of ▁spl ash - proof ing ▁of ▁the ▁joint s . ▁ ▁The ▁British ▁desired ▁modifications ▁for ▁the ▁tank ▁they ▁were ▁purch asing . ▁A ▁b ust le ▁ra ck ▁was ▁to ▁be ▁made ▁at ▁the ▁back ▁of ▁the ▁tur ret ▁to ▁house ▁the ▁W ire less ▁Set ▁No . ▁ 1 9 . ▁The ▁tur ret ▁was ▁to ▁be ▁given ▁th icker ▁arm or ▁plate ▁than ▁in ▁the ▁original ▁U . S . ▁design , ▁and ▁the ▁machine ▁gun ▁cup ola ▁was ▁to ▁be ▁replaced ▁with ▁a ▁simple ▁h atch . ▁Ext ended ▁space ▁within ▁the ▁tur ret ▁of ▁the ▁new ▁M 3 ▁also ▁allowed ▁the