Thanks for the tips and welcome, all!
@Ed Johnson it shoots like a dream, better than my M1, though don't tell anyone! And sadly I know no history on it, and know those records are lost on my B series - but the stock looks original, just very gently used - maybe simply stored in an armory and then a safe for many years? No matter, it's on the range with me now.
I'd like to go to a CMP service rifle match, hence the sling - but never been, other than a couple practice clinics. Do many folks use these in those matches? I shoot it better than my other rifles, so would be fun to try.