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.