You get kills with the gun you want to unlock attachments for. If you see your challenges it will tell you what to do to unlock the attachment.
You unlock it by getting to 10th Prestige.
you can unlock it with you're first killstreak award unlock
ak47
2nd prestige
You unlock the RPG at level 65.
No, you must have the attachment already unlocked
how do you unlock Municion viva on call of duty modern warfare mobilized
You have to get all of the attachments on the ACR to get the mastery.
You unlock it by getting to 10th Prestige.
you can unlock it with you're first killstreak award unlock
Level 48
ak47
I don't see why not.
Do the challenge "Ultimate Sacrifice" which you unlock be nuking the enemy while you are losing
Unlock the challenges for them.
You get it all at a certain level
lv.70