This is a cool mod based of Counter-Strike where everyone starts out with the same gun and levls up to a better gun with kills, I found a couple of videos on YouTube, one with the CoD version http://www.youtube.com/watch?v=SEp17Yg9YGM&feature=youtube_gdata , and one with the Counter-Strike version http://www.youtube.com/watch?v=iuM6wdEH0VA&feature=youtube_gdata , I personally like the C-strike one better with the Super Mario sounds and custom servers, but I think this can still work well on CoD