My recommendations are:
Buy a p228, it will save your life. (3rd pistol)
Always f1 autobuy cause you’ll forget to buy a kit at the most crappy moment.
If your rifle/smg runs out of ammo use q to fast weapon switch to your pistol. Reloading usually reorganizes your face in the worst possible way.
Don’t reload everytime you kill someone, they usually travel in packs.
Short and sweet bursts make for lots of head shots.
Running past a flash grenade can often counter its effects.
If you’re going to rush, don’t stop in a hallway or small room. This generally leads to your team getting raped within a few short seconds. On the same note, if you are on the team getting rushed, people generally stop in hallways and small rooms. This is what the HE grenade is for.
Watch the minimap, it tells you exactly what’s going on.
And last, make sure you’re talking to your team mates and they are talking to you. You put me on a team with Flakes or Brian, we can own another team with just the two of us by talking our way through the rounds.
And last again, talking puts a HUGE speaker icon over your head. Don’t talk and sneak; you give yourself away.