What gun to use in call of duty 4?

What gun/attachments/perks do you use?

well, my main gun is an AK-47 with Double Tap, an RPG and Matyrdom

It Really is all down to personal preferance, I personally tend to switch about which guns I use on different maps, when your on a small map like wet work, I either use the g36c with 3 frags stopping power and last stand or myterdom or the p90 with bandolier stopping power and last stand. but in larger maps you may want to think about using long range wepons like a sniper or the g3, if you do use a sniper make sure you have either overkill on or a desert eagle. take a look at this little guide, hopefully it will help you.

Small Maps.
Sniper- dont use
Assault riffles- very effective, best used with 3 frags stopping power and last stand/ myterdom
Smg- very effective, best with bandolier, stopping power, last stand/ myterdom
Lmg- decent- best used with bandolier, double tap, and again, ls or myter
shot guns, highly effective, esspecial on maps with lots of sharp corners, best used with 3 frags, overkill and ls or myter
im getting slightly bored with this so ill experiment a bit and come back and finish of the guide

Rpd Stoping power, 3 frags, deep impact