Also, you might try www.oldguns.net. John and Marc have a search engine on their website that gives this info for 1903's and a variety of other US military long arms. I've used it to check receiver/barrel dates when someone I haven't dealt with before is offering to sell a USGI rifle to me.
A forum community dedicated to Browning 1919 A4 firearm owners and enthusiasts. Come join the discussion about performance, gunsmithing, restoration, troubleshooting, reviews, accessories, classifieds, and more!