And there is another little trick you can pull, once you have the critter shooting properly again.
Your front sight is wide and stands there bold as brass. It is wide enough that it appears a bit crude. You can change it out for an NM sight, but, as pointed out, that makes things rough in low light.
So you leave the original wide front sight and you diddle with the REAR sight. Your FRONT sight covers 4 MOA of target. Your REAR sight is adjustable in clicks of 1 MOA.
You put the REAR sight out to the side by TWO clicks and your rifle now is shooting to the CORNER of your front sight blade. It works.
MY M-1 is out 2 clicks right and I aim with the upper-right corner of my front sight. My sight picture on a plate course is just as if I were shooting at a pie with one big slice missing.... and the bullets strike in the middle, which is where I want them. Shooting paper targets, using a 6-inch tarpaper square at 100, I touch the corner of the aiming-square to the corner of the sight blade and the rifle shoots into half an inch, off the sandbags, if you can hold it. I can't, any longer, because my eyes are going, but others have tried it, with my rifle, and they can do it, have done it, many times.
It works. Give it a try. All it will cost you is a clip of ammo.
.