Welcome Jerry! You will be pleased to know that your Springfield 1903 #1266799 is listed in the Springfield Research Services (SRS) database as an NRA Sporter sold on July 31, 1925. The serial number falls in the middle of a fairly long sequence of consecutive rifles made by the Springfield Armory as NRA Sporters. Based on the barrel date and star gauge test number it is highly likely that the barrel is original.