ðə sˈɛvənti fˈaɪv ˌɛmˈɛm ˌɔːɾəmˈæɾɪk ɡˈʌn wʌz tˈɛstᵻd ɪn ðɪs ˌɪnstəlˈeɪʃən ænd ɡˈeɪv ɐ mˈæksɪməm ɹˈeɪt ʌv fˈaɪɚɹ ʌv twˈɛnti ɹˈaʊndz ɐ mˈɪnɪt, bˌʌt wʌz ɐbˈændənd ɪn dᵻsˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈoːɹ ɔnðə bˈeɪsɪs ðˌɐɾɪt wʌz ˌʌnɹᵻlˈaɪəbəl ænd lˈɑːɹdʒɚ kˈælɪbɚ ɡˈʌnz wɜː nˈaʊ ðə pɹaɪˈɔːɹᵻɾi.
The 75 mm automatic gun was tested in this installation and gave a maximum rate of fire of 20 rounds a minute, but was abandoned in December 1944 on the basis that it was unreliable and larger calibre guns were now the priority.