You unlock it at level 42 and I suggest getting akimbo with it.
You have to achieve the Mastery challenge for that weapon. That is, unlocking all attachments.
You get 4 perks when you unlock your classes at lvl 4. you get 3 perks for your weapon and 1 perk for your deathstreak.
Unlock all the weapon attachments for the ACR. Or, if you are prestiged, get at least 500 kills or 250 headshots with the ACR.
get to level 48 and you unlock the ACR
no
Level 48
no
yes it does. For example if your a mastery at the ACR itll give u a title saying the weapons name in gold. U first have to unlock all the attachments for that weapon
You can not the game does not have it
get 2500 headshots
Unlock all attachments.
level 4