ɔnðə bˈeɪsɪs ðætðɪ ˈɛm fˈoːɹ wʌz bᵻkˈʌmɪŋ ˈɑːbsəlˌiːt, ðɪ ˈɔːɹdnəns dᵻpˈɑːɹtmənt ɹᵻkwˈɛstᵻd ðə sˈɛvənti sˈɪks ˌɛmˈɛm ɡˈʌnd tˈiː twˈɛnti θɹˈiː ˈiː θɹˈiː ænd tˈiː twˈɛnti ˈiː θɹˈiː biː stˈændɚdˌaɪzd æz ðɪ ˈɛm twˈɛnti sˈɛvən ænd ˈɛm twˈɛnti sˈɛvən bˈiː wˈʌn ɪn dʒuːlˈaɪ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi θɹˈiː.
On the basis that the M4 was becoming obsolete, the Ordnance Department requested the 76mm gunned T23E3 and T20E3 be standardized as the M27 and M27B1 in July 1943.