The assualt rifle Acr is unlocked at level 48.
Considering damage, the best assault rifle would either be the TAR-21, or the AK47.
Im pretty sure they have less zoom on assault rifles than sniper rifles.
It is set around 1968 so weapons around that time some are from modern warfare 2 such as the spas. 12 shotgun and AK47 assault rifle. However there are more shotguns than in modern warfare 2.
Level 70 - 5-star general - is the max prestige one can achieve. At that level, all weapons and abilities (not mods or camo) are unlocked, including the coveted AK-47 assault rifle.
In Call of Duty 4: Modern Warfare, the M14 rifle is unlocked at Level 46 in multiplayer.
Well that's a pretty vague question so i hope i answer it right for you. The assault rifle is a medium to long ranged weapon that usually has fairly good accuracy, on modern warfare some of the more popular are the Scar-H and the AK-47 and you earn different kinds of assault rifles by getting kills on multi-player (if that is what you were asking about) you can get different attachments too but the descriptions of how to get more are given!
In excess of 1.5 miles
level 5 second assault rifle in game
You G11 is the classified assault rifle meaning you will need to purchase all the assault rifles before it to unlock it. The highest assault rifle before the G11 is the Commando which is unlocked at level 44. So basically the minimum level to unlock it is 44.
You practice.
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.
Assault rifle.