Fal with select fire is by far the best AR. Anyone who says otherwise doesnt know what they are talking about. The next best after the fal would have to be a tie between the swat and the SMR.
The worst AR would have to be the scar or the AN-94 IMO.
Yes...I prefer Fast Mags for the 3 option of Gunfighter though instead of red dot. Scav + fast mags give you a permanent m27, and fast mags on m27 makes its decent reload almost instant. allowing you to stay in the battle, and even reload in the open against oncoming enemies.
I agree with this for the most part for core. I don't really play hardcore. I also haven't used the SMR enough to judge that gun. The only modifications I would make are:
Tier 1: FAL, AN-94, M8A1
Tier 2: MTAR, SWAT-556, SCAR, M27
Tier 3: Type 25
It's not that the Type 25 is bad. It just chews through the clip too quick and functions like you said. Worse than a sub at close, and slightly worse than many ARs at range.
I moved the AN-94 and M8 up because of the AN-94's 3 bullet kill range and the M8's burst speed. I moved the M27 down because it's just a bit too weak in core. Great accuracy though.