My book says Jun 1943, Springfield Armory.
If your gun is "correct" it will have the following parts
Barrel: 3-S-A-5-43
Bolt: D28278-12SA
OP ROD: D35382 6 SA
TRIGGER HOUSING: D28290-12-SA
HAMMER: C46008-3 SA
OR C46008-5 SA
SAFETY: C46015-9SA
and there should also be 1-2 stamps in the stock either a P with a circle around it or a mall crossed cannons acceptance mark.
Granted this would be a rough guide, IF your gun was factory new, most were not because they were overhauled several times by various armories around the world as well as soldiers doing field maintenance and the correct parts did not always go back to the gun from which they came.
Some of the parts can be quite collectable, and some can be unsafe to use, if they are worn out, chipped or broken. The M1 is a firearms marvel, especially considering the rifle that the enemy was using at the time was a bolt action rifle that held 5 rounds. General George Patton said, "The greatest battle instrument ever devised," in regards to the M1 Garand.
If you have any surplus M2 ball ammo place the round "bullet first" into the bore if the barrel eats the bullet all the way to the brass don't be mad if the gun does not shoot well.
Give us some of the numbers on your gun, it will be easier to determine what kind of gun you have. Just because you don't have a all numbers matching gun does not mean that there is anything undesirable about your gun.