 Approximately 100 conversions were completed by the beginning of May.By then, the end of the war in Europe was clearly in sight, and the U.S. Army decided the logistical difficulties of adding a new ammunition caliber to the supply train was not warranted.None of the converted 17-pounder M4s were deployed in combat by the U.S., and it is unclear what happened to most of them, although some were given to the British as part of Lend-Lease post-war.