Fast Ranking Advice

The First thing I would like to talk about is a method I use to gain experience faster by completing weapons. I like to make my kills do more work for me. What I mean by that is that i try to set up my guns and perks so that 1 kill scores me kills in multiple challenge areas. While this might be obvious to some, I'm not writing this for them. For example: I will use a class that has the M16A4 with silencer, and red dot sight. My perks will be bling, stopping power, and lets say ninja. and maybe a shotgun for a secondary weapon. getting one M16A4 kill with this set up will add 1 kill to the following challenges:

M16 Marksman
M16 Veteran (if in prestige mode)
M16 Expert (if its a head-shot)
M16 Master (if its a head-shot in prestige mode)
Holographic sight
Heartbeat Sensor
Bling pro
Stopping Power pro
Ninja pro (if its close range)


As you can see this set up maximizes the amount of experience I can earn in a match. I usually try to have this set up in more than one class, so if i complete a challenge I can switch to another gun, and not waste any kills.