Today, I will teach you about the silent-strike ninja, and how to make the perfect class!
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Primary-I love the ACR for this, but I have read where as people use Vector. You'll need (at the very least) a silencer. If you put Bling, A silencer and Heartbeat Sensor would do fine. You'll want an Assult Rifle or anything durable, efficient, and accurate.
Secondary-For this, I use PP2000 with silencer. But, if you have Bling (PRO), add either FMJ or a scope to that. For this, a Machine Pistol is your best bet.
Perks-I would pick either Marathon or Bling for this. Then Cold-Blooded and Ninja. Scrambler will not work for this type of class, because you need Ninja Pro's ability of silent footsteps. You need to make sure that every perk listed is Pro. Their Pro abilities are VERY effective in this type of class.
Equipment-Since this type of class requires minimal amounts of camping, I would use a Tactical Insertion. Grenades and other BOOM explosives cause unwanted attention. Maybe something like a C4 or Claymore could work well too. You'll probably want flash bangs, since they blind. But Smoke is also a good idea.