Just shortly after they were invented.
You go to custom slot and pick your weapon and then for attachments you pick no attachments or something that doesn't come with a scope.
Unlock all the attachments and complete all challenges.
You have to achieve the Mastery challenge for that weapon. That is, unlocking all attachments.
no, unless you pick one up. or you copy a class
If you mean the weapon controller attachments check out the Related Links below for a huge list of them.
u get nothing just ur attachments i got everything for my intervention nothing
get 500 kills with the weapon, it doesnt matter what attachments you have as long as you kill them with the ACR
bling pro allows for your secondary weapon to also have 2 attachments
Flywheel
This is a new perk that allows you to have more then one attachment to your gun such as, thermal sight and silencer, or once you get Bling Pro, i think u can have 3 things such as heartbeat sensor, silencer, and acog scope on at once.
You select the weapon, then select the maximum attachments allowed, and then it takes you to the camouflage.
I like the UMP45 with rapid fire and extended mags. I also like the MP7 with the same attachments.