The RPK is my favourite.
AEK-971 because it makes you cry.
M416 definitly is my favorite so good accuracy you almost never miss a shot if you practice with the gun medium range it can take on every weapon short range depends if the other may got a G18 famas or aek
and long range it can handle pretty good this is my weapon i hope you all agree 
The AUG assault rifle is pretty nifty as well. Low recoil, looks and sounds great.
Claymores. <3
Ace-23.
Least favorite : AN-94 because it’s complete garbage in BF4.
SCAR-H, you could take out easily 3 players with 1 mag (up to 5 in hardcore)
RPK (OG variant), PKP (Bipod FTW), and the M4 Carbine, save for the god awful burst fire mechanics. Also the Scout Elite, just for the LOLs.
I will say though, the AR160 (Tapfire king) and the M249 are quickly becoming two of my new favorites.
You actually know what you are talking about. Do you play HardCore? Both of those guns are beasts.
Assault: I can choose one, there are too many I like. But if I had to choose one it would be… damn I don’t know.. SCAR-H?
Support: U-100 MK5
Engi: CZ-3A1/MP-7
Sniper: L115 (perfect balance betweent, rate of fire and bullet speed)
DMR: QBU 88
Carbine: SG 553
L85A2 , don’t sound like the real thing sounds like it has a BFA on it and never jams in BF4 which is good , unlike the real version
I’m gonna have to go with the canister shell. It’s just a ton of fun mowing down infantry with it, but it requires a lot of skill and accuracy, so it’s not for everyone.