Like we said, if it's close combat the zooms of ACOG, TF, etc. will have you at disadvantage. But you'll need to learn when to use this type of guns and attachments and in what maps. Because the SMGs are the most efficient in close combat obviously.
I love the FAL. I used it until I got Select Fire, and now it's incredibly easy to use. I tried it silenced, but that was a no go. But seriously, the FAL is great.
Once I unlocked the AN, I used that. Actually, it's what I permanently unlocked after my first prestige. Great gun, really. It does well CQC(especially with the Quickdraw attacent) and midrange, and long range if you remember to shoot in bursts of 2-3.