OMIGOD!!½½""½!"HALF-ELEVEN!!!"!"!
both of those requires.... no skill and a huge amount of free time. Seriously, even a 8 year old kid can get a golden ak if he plays long enough.
On top of that, cheating your way to those golden weapons is so easy.
And besides, 90% of cod players are so dumb that it's not even a challenge. Yesterday I was playing and got a kill/death ratio of about 15. (hardcore tdm)