1) Position Yourself on the stairs near the bowie knife. You can have 1 man cover the window while 3 people spray down the stairs, when you start hitting round 25+, fall back to the mystery box (on the stairs).

2) The bridge technique, the bridge is located near juggernaut 2 people sit on the bridge and 2 people do the windows near juggernaut. WARNING: DO NOT OPEN THE STAIRS NEAR JUGGERNAUT, THIS WILL RESULT IN YOU GETTING PWNED.

3) Last, my own technique, Position yourself on the the left side of the map. EXACT LOCATION: near the m1a1 carbine, leave both doors near the m1a1 carbine shut. 1 person does the window near the back, while the other 3 people have an easy time shooting down the little road thing. I your not clear of what im explaining, here's a full description. 3 guys stand near the m1a1 carbine. There is a door right next to the m1a1 carbine which lleads to the mainframe, DO NOT OPEN IT. the is a window at the back which 1 person does. the is a door opposite the window, DO NOT OPEN IT.

Now you should be well on your way to the high round 30's.
If you need any more help add my GT: zI RaP1Dz Iz