Yep, just opened pandoras box. As others have stated, just go to CMP and get you a nice service grade for $750. But if you want to get specific. Which manufacturer? In order of rarity/most wanted, it goes International Harvester, Winchester, H&R, and Springfield. A Winchester will be a guaranteed WW2 as they only made them then. IHC and H&R will be post war and SA will be either or. The best fit and finish for Garands have been H&R or late SA in the 5.25 mil serial number and up. For collecting, original barrel is a big deal and you will find the chamber is in the white if original, parked if not. I think WW2 rifles are cooler if they have the original inspectors cartouche vice the DoD eagle and stars that started in the mid 50s. But if you want a good shooter, usually want the muzzle wear to be less than 3. I have a 44 SA that I've hit steel out to 500 yards and I have Winchester M1D (sniper configuration) with a 2.5x power M84 scope that I've been able to hit steel at 800 yards. Both of the muzzles measure a 1 on my gauge. The nicest of the rebuilds have been known to be Letterkenny which are marked LEAD then the month and year (ex 1-67) on the receiver legs. Of course there is a bunch of sub categories into collecting such as Win-13's and Marine Corps rebuilds, but yeah just go to CMP if you just want an honest M1 Garand but make sure you get a service grade or better. (although some of the field grades people have been receiving have been very nice with original GI wood.)