KH2002- is a 3 round burst. it will get you a kill or two long range and short range. medium range is where this gun is good.
G3A3- automatic. it is good for long range decent at mdium and sucks at close range.
M26 MASS- has 4 different ammo. buckshot, which is a best at close range. dart, which is alright in the right situation. slug, which is good at all ranges when you get used to use it. frag, these are garbage now. you will get one to two kills before you die and thats if you are lucky.
AK-74M- automatic, good at long and medium range. pretty good at short range once you get used to the recoil.
F2000- i dont like this gun that much so i have not used it.
M416- is a beast after the last patch. its good for long and medium and short range.
M320this has 2 different ammo it can shoot. smoke , which is good for rush and can be useful at times on conquest. buckshot, which is a beast at short to medium range and ok at long range. and i think it has a regular grenade it shoots as well.
AEK-971- is pretty good at long and short range. is a beast at medium range.
AN-94- have not used this gun that much or if at all. i am going to start to see how it is myself.
M16A3- is a beast after all the nurfs it went through. good for all ranges.