Re: M1903A3
Hmmm. I just re-read the OP. I don't think Rock Island made 03A3's. I believe they only made 03's. Makes me think something might be fishy. Hopefully someone with more knowledge or some reference handy can chime in. Here's something I pulled from a Rock Island History page:
" The Model 1903 rifle, a .30 caliber, bolt-action rifle, was first manufactured at Rock Island Arsenal from 1904 to 1913. Approximately 234,000 rifles were produced. Production was reestablished in September 1916. During the First World War, nearly 114,000 Model 1903 rifles were manufactured in whole or as repair parts.
A wide variety of personal equipment, such as 1,512,190 bacon cans (or mess kits), 354,770 mess knives, 649,457 canteen covers, 858,344 haversacks, and 400,256 pack carriers were produced at the arsenal during the First World War. Until August 1, 1918, all artillery harness supplied to U.S. forces was manufactured by the arsenal, and a total of 24,212 sets were made and 74,207 sets were assembled.
Recoil cylinders and complete artillery carriages were manufactured for the Model 1906 4.7-inch gun and the Model 1902 3-inch gun. When the French 75mm field gun was adopted for U.S. use, the arsenal was assigned the task of developing and producing its hydropneumatic recuperator.
The only time that the arsenal was involved with ammunition production was during the First World War. During the war, 167,195 155mm howitzer shells were loaded.
Between the wars, Rock Island Arsenal concentrated on its dual missions of tank and artillery development. At the beginning the Second World War, emphasis was placed on artillery production. Production of artillery carriages reached 600 per month. Almost 25,000 recoil mechanisms for various artillery pieces were manufactured."