No, there are no gold weapons. However, with certain amounts of kills or headshots, you can unlock emblems and titles for the weapon they were achieved with. The kills part also applies to killstreaks, like the AC130.
The related link lists and described the weapons used in Call of Duty Modern Warfare 2
no
Yes.
well call of duty and modern warfare are the same it is called Call of Duty: Modern warfare and then came call of duty: modern warfare 2
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
Call of Duty Modern Warfare came before Call of Duty Modern Warfare 2
65 or 70 i play mw2
The related links lists the weapons in the games and how they are acquired
Just kill people
"Call of Duty 6" "MW2" "Modern Warfare"
"Call of Duty 6" "MW2" "Modern Warfare"
Call of duty modern warfare 3