In cod 4 it would probably be the ak 47
In cod 5 I don't know i'v never played it
In cod mw2 it would probably be the ACR
In cod black ops(BO) it would probably be the commando
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cod 5 is my favorite because it is more recent and there are better weapons too. cod 5 does not reload the guns correctly cod 3 does and it has tanks jeeps and moterbikes
Gun Game.
all guns cost 2000 cod points which you can earn in 4-6 matches and there are 36 guns i think hope this helps
Nothing only you can upgrade 5 guns in pack a punch in COD 5
Unlock By Leveling Up, And Purchasing With COD Points