Development of three prototypes was initiated in the interval between the testing of the XP-936 (P-26 prototype, company Model 248) and the delivery of the first P-26A (Model 266) to the U.S. Army.
Pengembangan tiga prototipe dimulai pada interval antara pengujian XP-936 (prototipe P-26, perusahaan Model 248) dan pengiriman pertama P-26A (Model 266) untuk Angkatan Darat AS.