1. Top stock - the markings you describe are a little confusing. The only two I can definitely nail down is the AAJ - a overhaul stamp from Augusta Arsenal, if it is in large letters, and the RA-P from Raritan Arsenal, possibly WWII. The stock itself, appears to be a "straight wall" stock from about 1910 or before, or at least it started out that way. It would have had no stock bolts or maybe the rear one and later, during overhaul, had the second one added. What "end" are you talking about? The forward end "wedge" that you see when you look at the muzzle? A pre-WWI SA stock would have a 1/8" S and a RIA would have a 1/4" S. Maybe take a shot at a picture of the area where the inspection stamps are.
2. Middle stock - actually, the "bare" RLB was used slightly after (and somewhat concurrent to) the box RLB. Could be a 3,050,000-3,100,000 range Remington. The boxed RLB was used from the start of Remington production, by the way.
3. Bottom stock: Does the stock have "slots" for a 03A3 handguard ring? If not, the stock does date to about a 3.2M range Remington M1903, before the "pinned" stocks were introduced later in production.
"We make men without chests and expect from them virtue and enterprise. We laugh at honor and are shocked to find traitors in our midst."
--C.S. Lewis