primary-- for short range (summit) ak74u w/ grip and rapid fire. kicks ass
I go galil/AUG until I unlock the commando.
Long range, many people are fond of the L96A1 and I used that for awhile, but now I prefer the PSG1 because of its low kickback.
galil/aug usually have a masterkey attched, but also have another createaclass with aug acog sight, and galil silencer. I hate reflex sights, normal ones have a way bigger hit radius. Aug acog just kicks ass tho because you can pick of people behind cover VERY easily. headshots are simple with it as well. That being said, with noral sights if youre touching the sight ANYWHERE on them, its a hit, but otherwise you just have a little dot or other thingamajig.
secondary-- always strela3 for choppers and occasionally spy planes. except w/ the ak74 i go crossbow.
lethal- frag, for the bounce
tact- flashbang
equipment- claymore, motion sensor, or camera spike depending on the map. camera spike or motion sensor can get more kills than a claymore if you watch them, but claymore is nice because when youre scoped in with a snipes, you can't see your spike or sensor feed.
hardline pro for kills/carepackages
SoH pro for combat. insta-ADS helps a ton.
Second Chance pro. tons of people revive you if they can. helps keep the killstreak alive, so a better chance of getting... --->
Killstreaks-- care package, attack heli, chopper gunner.
BUT--------with hardline pro, consider sam turret, sentry gun, care package, as you can change them all. can get a lot more killstreaks total as well to make up for less power.
Haven't reached my max k/d yet. Told my brother to stop playing, and it went up .2 over this Winter with me not playing too much. GL.
edit-- please, don't use rc-xd's or grenade launchers. I used a grenade launcher for a few games once, and then I realized no one liked me. upon going back to a normal gun, I found my actual playing skills had deteriorated. once again... rc-xd's and grenade launchers (and losers who only run around with shotties) are uncool. sorry if any of the above criteria apply to you, because I basically just called you a loser, but you must realize that in the gaming community this point of view is common.