According to ViShooters tables, this bolt was from 1/08-10/08 from ser.# 227022 thru 342194. My serial # is 600364. Would a bolt this old be used in an arsenal rebuild? JSA is for J.S. Adams who worked from 1897-1920 at SA, which would make sense for this rifle that has a build date of 1915. But there are no armorers marks on the stock. Could this possibly the original set-up with a different bolt?