Assault rifle challenges in Call of Duty 4 can give you extra experience and give you camo for your gun. They may ask you to do something like get 10 head shots with a rifle.
The dragonov sniper rifle, m1040 shotgun, m403 light machine gun, and Ak47 Assault Rifle all have the ability to get gold weapons if you complete all challenges.
There is challenges that you have to complete, for instance, if you want the golden AK-47 you have to complete all of the assault rifle challenges. And for the golden UZI you have to complete all of the sub-machine gun challenges, and so forth.
The assualt rifle Acr is unlocked at level 48.
It was the Commando assault rifle with Red Dot Sight and Suppressor.
with assault rifle, lmgs, smgs must be with headshots and shotguns, snipers must be with normal kills
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An under barrel grenade launcher attachment on an assault rifle. They call it a "noobtube" because "noobs" use it and it is shaped like a tube. I use them for fun and call them protubes.
Its an assault gun
Titles are earned by completing challenges in multiplayer. Go to barracks -> challenges in the multiplayer menu to view the challenges. Several titles are earned for prestiging, completing spec ops missions, and through call of duty elite.
Just complete all assault rifle challenges and the gold camo wiill be unlocked. Enjoy.
They can be found in the "barracks" in multiplayer mode.