Try getting a big map.. Hold down one corner of the map by flanking between two points
Your going to need.....
**Almost** Smg - Easy mobility for flanking/quick aiming while running between points
Flak Jacket (In case they toss any explosives in your direction)
Cold Blooded (If they are using target finders)
Scavenger (Replenish ammo & equipments)
Tactical Mask (For all the flashes and shock charges that'll be flying your way)
Bouncing Betty (Surrounding your two points)
Shock Charge (Place right by Betties to stun enemies (and alert you) while Betties do their job.
**Do Not try and control the entire map. There's too much lag for you to accurately win most gun fights.