Thanks, King Snake!
The 2-43 means the barrel was made in Feb 1943. If there is an "RA" along with those numbers, then Remington also made the barrel!
That stock is what is called a "scant" stock - the pistol grip on it is "scant" - not a full pistol grip and not the old straight stock. Typical for that year of production, so the stock is possibly (likely) the one originally installed. Good news for a prospective buyer.
Told you the 3rd question was the hardest. As Boggus said, those are measurements of the throat (just in front of chamber) and muzzle wear. Not commonly measured on any guns except 30-06 and 308 (7.62) US military guns, because the gauges just don't commonly exist.
But, if you had bought that from a military gun dealer or this was a CMP rifle, commonly those numbers have been measured and written down. Without them, most folks will want to know bore condition. Shiny and sharp rifling, shiny, frosted lands, frosted, lightly pitted, heavily pitted, or sewer pipe - those would be typical descriptions of the bore when cleaned up well.
For the CMP releasing surplus rifles now, a Garand with muzzle wear MW of not more than 3 and a throat erosion (TE) of not more than 5 would be the worst barrel wear that would let the gun be classed as a Service Grade rifle. (They are not releasing any 1903-A3's now). Guns used for any kind of target work often get a replacement barrel at about 4-5 MW.
Good luck, GJ
