I have wrote my own Call of Duty 4 mod guide. I have found that good modding guides are hard to come by and by making this guide I have tried to make it easier to mod. If you do distribute this file please give me credit, it's not hard and its the polite thing to do.
This is a mod that will put the mp5 with a reddot and silencer, m21 with silencer, m4 with silencer, reddot, and m203(nade launcher) and the at4. Pictues at this link- http://105th.clanservers.com/viewtopic.php?f=22&t=43