SA Drawing Numbers Question

I just purchased an M1 Garand to complete my WWII battle rifles collection, and was doing some research into the lineage of the parts based on the drawing numbers.

It is a SA April 1942 receiver with a SA 1952 barrel. The drawings numbers for the bolt and trigger housing are correct for the 1942 receiver date.

I can't seem to determine the time frame during which the hammer and operating rod were made. The hammer is numbered SA C5546008. The Op rod is numbered is D35382 SA. From the websites I've looked at regarding drawing numbers, it almost seems like some digits are missing. Here are the pics. Can anyone help me out?

https://www.milsurps.com/images/impo..._4012JPG-1.jpg

https://www.milsurps.com/images/impo..._4051JPG-1.jpg

https://www.milsurps.com/images/impo..._4042JPG-1.jpg

Your op rod is post WW2, used in rebuilds starting after the war, your hammer is from the 1950's time period

Thanks. Just the kind of info I was looking for. Now, how about the stock markings?

https://www.milsurps.com/images/impo..._4052JPG-1.jpg

https://www.milsurps.com/images/impo..._4057JPG-1.jpg

https://www.milsurps.com/images/impo..._4056JPG-1.jpg

From what I have researched so far the AA stands for Augusta Arsenal. Would this have been where the rebuild was done in the 50s? What does the P and the RA stand for? WRA perhaps?

The P is from test firing and the RA is Raritan Arsenal.

So does this mean it was rebuilt twice? Once at Raritan and once at Augusta?

It sure could have been. Some of those could have been through multiple rebuilds. Maybe after WW2 and then again after Korea.