When the U.S. entered World War I, the P14 was modified and standardized by the U.S. Ordnance Department and went into production at the same factories as had produced the P14, production of that rifle having ceased, as the Model of 1917. Sometimes called the M1917 Enfield, it was chambered for the standard US .30-06 Springfield cartridge and enjoyed some success as a complement for the Springfield M1903 rifles which were America's official standard issue, soon far surpassing the Springfield in total production and breadth of issue.