Like everyone else, I recommend a void primary. My first time I did it with just a shotty, heavy, and my abilities, so it isn't necessary (though at the time I was pretty good at pvp still) Snipers are actually the best special weapons, in my opinion, as they keep you the furthest from the action. If that's truly all you have, find a decent control team (or just try till you get lucky), pick a side of the map, identify the high traffic areas, then find somewhere you can stand with your scope on that area where either just your gun is sticking up enough, or you have a wall immediately to your left or right you can duck behind. Some maps will allow you to have your sniper spot in the immediate vicinity or nearby of a heavy ammo spawn, allowing you to get that once or twice a game. Lastly, since death slows your progress, if a situation comes down to fight or flight, FLEE. If you go around the corner and someone has the jump on you, back up and let them come around the corner. Now you have the jump on them. If you run by a room and see 3 guys headed your way, get behind cover and run as fast as you can back to your team. At least one of them will chase you and get picked off by your teammate, now you only have 2 enemies to deal with. I hope this helps. Godspeed