Plant claymores along the path the Juggernauts take (which would be from the gate and along the inside wall, on the pillar opposite from the scaffold, and up the scaffold ladder).
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Then, continue to the scaffolding on the outside deck of the oil rig. On the Special Ops level, "Armor Piercing", take the Barret.
![xbox 360 call of duty modern warfare 2 multiplayer xbox 360 call of duty modern warfare 2 multiplayer](https://i.ytimg.com/vi/5GssmezhwzI/maxresdefault.jpg)