Initially, a request for full production was denied as 90 mm guns were already being studied for use on tanks, but Army Ground Forces approved the project in October 1943, and tests began.
Awalnya, permintaan untuk produksi ditolak karena meriam 90mm masih diragukan kemampuannya, namun Angkatan Darat Amerika menyetujui proyek tersebut pada bulan Oktober 1943, dan tes dimulai.