I bought an MR1 about 3 months ago and it came with both apertures. Guess I'm luck but not sure on that. The rifle works great for me as I have put about 2K rounds though it so far with no problems and that is with all reloads. I don't do bench shooting except to sight it in so cannot say exactly what it does for groups, but during sight in it was definitely shooting 2" or better. I have take a couple of coyotes with it using iron sights at 100 yards give or take a few yards, and a couple more at 150 + yards with a low power scope. I may be lucky but with the rebate from Benelli I was able to buy the weapon for under a grand and felt that was good enough.
I have AR15's and although I have used the M16 in combat I have never liked that weapons platform. It just never seem that good to me although my wife loves them. I don't find that they shoot any better than the MR1 and they do require more cleaning.
I'm just glad to have the gun and use it all the time.