Thanks for all the suggestions! I will try most of these tonight, and try to find which one works best. I think if you put the holographic sight on the fal it is one shot kill in hardcore.
Holographic Sight Vector. 2 shot kill across the map, 1 at close. No recoil, extremely fast fire rate. This gun was made for hardcore.
As far as everything else goes:
OMA Pro - More Claymores, unlimited ammo.
Coldblooded Pro - Killstreaks won't see you.
Ninja Pro - HBS won't see you.
Claymore - Set 2 up near the bomb by using OMA. Even if you're on offense, once you clear the area where you will plant the bomb, lay out the claymores.
Stuns - Can kill directly, and are thrown super fast.