[P89]

Originally Posted by brian

it was overhauled.

I agree.

World War II saw new production of the Springfield at private manufacturers Remington Arms and Smith-Corona Typewriter. Remington began production of the M1903 in September of 1941, at serial number 3,000,000, using old tooling from the Rock Island Arsenal which had been in storage since 1919. The very early rifles are almost indistinguishable from 1919-made Rock Island rifles. As the already worn tooling began to wear beyond use Remington began seeking Army approval for a continuously increasing number of changes and simplifications to both speed up manufacture and improve performance. The milled parts on the Remington M1903 were gradually replaced with stamped parts until, at about serial number 3,330,000, the Army and Remington recognized that a new model name was appropriate. Other features of the M1903, such as high-grade walnut stocks with finger grooves, were replaced with less expensive but serviceable substitutes. Most parts made by Remington, stamped or milled, were marked with an "R". The M1903 became the M1903/A3. The most noticeable visual difference in the M1903/A3 was the replacement of the barrel-mounted rear sight with a smaller, simpler "peep" rear sight mounted on the rear of the receiver. All stock furniture was stamped metal. In early 1942 Smith/Corona Typewriter Company also began production of the M1903/A3 at its plant in Rochester, NY. Smith/Corona parts are usually identified by the absence of markings (Smith/Corona bolts are sometimes marked with an "X" on top of the bolt handle root). Original production rifles at Remington and Smith/Corona had a dark gray/black finish similar to the Parkerizing of late WW1. Beginning in late 1943 a lighter gray/green Parkerizing finish was used. This later finish was also used on arsenal repaired weapons. It is somewhat unusual to find a WW1 or early WW2 M1903 with its original dated barrel. Much, if not all, WW2 .30-06 ammunition used a corrosive primer which left corrosive salts in the barrel. If not removed by frequent and proper barrel cleaning these residues could cause pitting and excessive wear. In the jungle fighting on various Pacific islands cleaning was sometimes lax and the excessive moisture compounded the corrosive action of the residue.

http://en.wikipedia.org/wiki/M1903_Springfield_rifle