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I like the no perk/attachment challenges though. Makes you get a feel for the gun again. I do them both at the same time and hate every step of the journey. I usually rock out an Assault Shield as my Primary though, so it can deflect bullets shot at my back.
Shield (weapon here)
Tactician Wildcard Tactical Insertion (gets the challenges done quicker) 2 Tactical Grenades of your choice.