Kammala wannan jumla: A shekara ta 1906, Amurka ta kimanta wasu bindigogi masu sarrafa kansu da aka yi a cikin gida da kuma kasashen waje, ciki har da Colt M1900, Steyr Mannlicher M1894, da kuma shigarwa daga Mauser. Kodayake Springfield Armory a baya ya sayi bindigogi na Parabellum na 7.65x21mm don gwaje-gwaje biyu daban-daban a cikin 1900 da 1902, hukumomin Amurka sun ƙi harsashi na 7.65x21mm a matsayin wanda ba shi da ƙarfi don amfani da soja. A cikin 1904, an gwada ƙananan adadin bindigogi na Parabellum a cikin sabon, mafi ƙarfin 9 × 19mm, amma hukumomin Amurka sun sake ƙi bindigar. A wannan lokacin, rahotanni da yawa na rikice-rikice na rikice-rikice na rashin ƙarfi na sojojin sojojin Colt.38 da aka yi amfani da su a cikin 1899-1902
Tashin hankali na Philippine da kuma binciken da aka samu na sojojin Amurka da aka samu daga gwajin Thompson-LaGarde ya haifar da buƙatar bindigar soja a cikin.45 (11.25mm).