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If you want a ninja defuse class use the following:
AK74u w/ silencer
Ballistic knife
Tomahawk/frag
Flash bang
Perk 1 Ghost Pro. so they literally can't see unless thier standing over you
Perk 2 (anything you want really, i use warlord pro for red dot sight)
Perk 3 Ninja Pro. what's a ninja defuse with out the ninja? plus, they can't hear ya.
A method i use for ninja defusing is the usual, sneak up behind while they plant, but when they do that, knife em, evens it up a bit, and you don't have to worry about him. easy defuse and win. AND NEVER SHOW YOUR HIDING SPOT. EVAR.
*edit: if you have anything to add to this, or have your own load outs that you think works better, feel free to post them.