I agree i am having so much fun with these iron sights! Best sights i have ever used just need more practice time.
Essentially, in a nutshell, what you want to do is set your elevation drum 10 clicks up from bottomed out.
Zero your rifle with a 150gr FMJ cartridge of your choice. Any surplus 7.62mm NATO is essentially designed for this rifle and calibrated to the drum.
Shoot groups at
100 meters and file the front post down with a small thin flat file keeping the angle the same ie pointed down towards the muzzle until your point of impact matches your point of aim.
Get your windage left and right zeroed after this using the rear right dial.
Once this is bang on to your liking, hold the elevation (left side dial) steady and unscrew the screw in the center of the drum.
Rotate the dial until the "1" mark on the dial is in line with the notch on the receiver right next to the dial.
Keep holding the dial steady and tighten the screw back down until it's snug.
Your sights are now calibrated.
If you want to shoot a target at 200 meters (assuming use of standard 150gr FMJ NATO type ammo) set the dial to the 2, 3 for 300meters etc etc
It's not just "minute of man" either, it's scary effective.
One thing I did with my Norc is I actually slowly filed down the front post after to about half the diameter for even more precision (if your eyes are strong). This will affect your windage so you may have to give it a click to the left or right on the rear drum to compensate for the thickness reduction of the front post.
You can use engine block paint after to seal the freshly exposed metal. Just adhere to the application instructions and dry/cure time instructions. It's the poor mans armacoat and it costs less than $8 a can.
One thing to note is that the M305 rear sight assemblies are hit or miss sometimes. The screw will not stay tight sometimes, the little gear can strip out sometimes etc If you experience this don't get disheartened, just pick up a used set of M1A sights off the EE for dirt cheap and swap them out.