About three years ago, my 57 yr old eyes at the time suddenly would not cooperate with me at all when it came to using irons. I got lucky on the EE and found great deals on a slightly used ML3 as well as a T1.
I ended up ordering a couple of Ultimaks, one for an M1 carbine and the other for my 18.5" LRB. The ML3 is a 2moa dot and I figured it should go on the M14 and take advantage of the M14's accuracy over the carbine. It's not an "accuracy" issue between the two optics, but that smaller dot makes a huge difference especially as your range increases.
I've got no regrets on my decision and couldn't be happier with the results. The best mount to achieve the best cowitness is the Aimpoint ring. Cheapest place by FAR to purchase is from DSA:
http://www.dsarms.com/Aimpoint-Extrawide-30mm-Rings-Picatinny––-AIM10818/productinfo/AIM10818/
At first I thought I wanted a QD mount...guess that was wishful thinking hoping my eyes would get better. I realized all the QD mounts put the optic a little higher than the Aimpoint ring. When I finally found a great price at DSA for the Aimpoint ring, it was a no-brainer. That mount will give you the lowest co-witness possible and it's actually up to three times cheaper than other sources for the same mount.
By the way, the T1 on the M1 carbine doesn't give me as good a co-witness as the ML3 does on the M14, but it's acceptable and for my eyes, the Aimpoints have allowed me to continue to shoot without having to resort to magnified optics and enjoy true cowitness on the M14 platform. None of this would be possible without the Ultimak mount.
I say go with the ML3 in 2moa with the low aimpoint ring and the Ultimak mount and don't look back!
Lappy