I like both the SCAR and HAMR due to their extremely awesome irons once you get the flash off. Assault Rifle base zoom is 1.35 which is equal to Reflex Sight. LMG base zoom is 1.5 times which is equal to EOTECH. You pretty much get a free sight.
LMG - MK48 - no difference expect at extreme Turbine Ranges AR - Scar-H - again only at really long distances will you notice the drop-off SMG - MP7 or Skorpion - fire rate is fast enough that if you're on target an extra bullet doesn't matter SR - DSR - still one hit kill above the waist, just not in the arms anymore Shotgun - M1216 - range is so pathetic, you may as well