From the standpoint of a target rifle, shooting at bullseye type targets, the AR with its target type aperture sights will usually shoot a tighter group than an AK. Theres no argument there.
Take the fixed aiming point away, and the groups between the two are very similar. Put a red dot on both, and again, the groups are also very similar.
One thing I've always found interesting about complaints about the AK's iron sights is, they are the same style/type sight as most of the older surplus military rifles, and most all US hunting rifles that most of us "old" boys learned to shoot on. If anything, the AK's sights are better than most of the hunting rifles. Yet, you hear all these complaints about how bad the AK's sights are to shoot with. Anyone want to explain that to me?
The 3-4" at 100 yards is nothing special, and as I said before, I have, and have had a number of different AK's, across the price ranges, from the lowly SAR's to the so called better quality guns, and 3-4" seems to be about average for me when the gun has decent ammo and is barreled in the country of origin. I have a Krebs Saiga conversion, which has a 14" barrel, and its the one that shot the 100 yard groups on those targets above. The head portion of those targets is 6" too by the way, so you have a better idea as to the size of those groups. Those groups were shot with a dot, the SAR's groups were with the issue iron sights, and that is a 200 yard target, so you do the math as far as MOA goes. I dont shoot bullseye targets, nor do I shoot from a bench, with either platform, and my AR targets, using either a dot or aperture and GI spec ammo, are again, very similar to my AK groups at the same distances.
Its not just the difference between AR and AK. These were shot with my SOCOM and one of my AK's at 100 yards. At this point, I dont remember which one was shot with which. Do you think it really matters?
Ammo also has a lot to do with what your getting downrange. If your all worried about shooting little groups on paper, do you know what ammo your rifle likes? If so, and if its possible, when you find something it likes, do you buy us as much of that lot as you can when you do find it? This isnt just an AK problem, it goes for anything. My old MP5 would shoot 12" groups at 100 yards with the old Norinco/China North bulk 9mm. Switch mags and put Federal 9BP in the gun, and the groups would shrink to about 4" on the same target.
I think part of the problem here is, there are to many variables to really be objective about the whole thing. There are also a lot of unbalanced comparisons when the comparisons are done. To be fair, you have to make the comparisons at least the same sort of fruit. (gun and shooter)
I still stand by what I said earlier,
its usually not the guns fault if you cant shoot it well.
If you've actually taken the time and effort to learn the rifle/platform, and know how it shoots, then you'll know whats reality and what isnt. Learning on one platform, and shooting it well doesnt mean your going to pick up something else and right away be an expert with it, just because you shoot the other gun well (do you shoot it well all the time too, or just that one time?). I hear this all the time about the AK's ergonomics and how its not possible to easily work one, or to shoot one well, due to one excuse or another, usually from someone whos whole experience with one was a couple of mags out of his cousin Billy Bobs AK off the back porch at the 4th of July. Yup, that boys got it all figured out.
Believe it or dont, the AK and AR really aint all that far apart. Their human counterparts on the other hand........