Light Machine Gun = LMG
empty a full LMG clip into enemys without missing or reloading.
Its automatically unlocked. Its a preset LMG and is customizable at level 4 when you unlock custom classes.
its probably one of the hardest challenges to complete.you have to fire an entire lmg mag into enemies without missing
If you don't then keep on going till it says DONE
Noob wepons are LMG and for MW3, LMG'S and FMG9'S
LMG
LMG
LMG pro means Light Machine Gun Professional.
Multiple thousands of USD
They have the most ammo per magazine in the game but it takes the most time to reload so do it in a cleared spot when your ammo is low (best to have sleight of hand perk). if your in a combat situation and you need to reload then switch to your secondary weapon (if you dont have a launcher) and kill them with it.
LMG
MW2 dum,dum. :(