Here is some iteresting photos of a chrome faced reciever. I assume the armory chrome faced them so the barrel would index properly, if the reciever was out of spec.
https://www.milsurps.com/images/impo...SAM_2786-1.jpg
https://www.milsurps.com/images/impo...SAM_2787-1.jpg
The reciever on the left is a four digit SA, the one on the right is an early WRA.
Bubba
