As Issued 1944 IBM M1 Carbine

[deldriver]

Only notches are on the left side.
https://www.milsurps.com/images/impo...0d28c7_z-1.jpg

All three of my late Winchester carbines with original adjustable sights are staked only on the right or starboard side. That was the point I was trying to make say versus Inland who sometimes did it differently from what I've seen on my own Inland carbines with original adjustable rear sights.