Used 'em all at one time or another. Retired ACR 6.8 after getting 2500 kills with it, and the G36C after getting +5000 kills and 500 headshots.
Now I stick withe these three -
1) FAD (my favorite of all the ARs)
Keep your powder dry,
I just can't do well with the FAD. Or at least I don't feel like I do as well. It seems like I die an awful lot with it. It's not good on the small maps becaue of the sub machine guns and FMG's and it's not great on the big maps because of snipers and the other assault rifles. I don't know. Maybe I just suck with it. Thought it did seem like on the last few times I used it that I was suffering from lag comp more than anything. I would start firing, not get hit markers, and then fall over dead. I can't do crap with the AK47 either.
Forgot to mention that I also like the G36C and have gold camo for it. I think I used red dot and kick with it. I quit using it to get gold camo for the scar and cm901 a while ago so I'm not 100% sure if those were the attachments I used but I think they were. My favorite assault rifle is the Scar though.
AK47 is my favorite AR, followed by the G3Sek-C though I haven't used it this prestige really, and the CM901 which I started using this prestiege.
Ak outraged with Kick and Ex. mags
-Recon (Best Perk ever)
-Hardline (Best combo perk with recon)
-Steady Aim (Its already good with medium-long thanks to kick and I find it alot more useful with it)
G3Sek-C Impact: Ex. mags or Attachments Silenced/RDS (lets be honest it doesn't have the best sights)
-Dead Silence/Sitrep (Sitrep for finding campers then I just wall bang or Dead Silence to creep up on people. Thats right Pika's a creeper)
(You know, going old school )
eh copy and paste on either of those last two classes
You ALL forgot the BEST AR in the game BY MILESSSSSS!!
Deadly from long range, and even deadlier from close range. Stick a red dot and ext mags, with marksman, and steady aim, assassin, and scavenger, burst fire from long range, hipfire from close range, your a moab waiting to happen