For more open areas I use:
Primary: ACR
Secondary: M1014
Equip: Claymore, Flash
Bling Pro [Holo, noob tube]
Stopping Power [or Cold blooded]
Ninja Pro
Martyrdom
For smaller areas like Favela, I swap out my ACR for UMP45 with holo
M1014
Clay/Flash
Scav Pro
Stopping Power Pro
Ninja Pro
Martyrdom
PSN ID: GThreeThreeK