Originally posted by FarSideX
You need 510 kills from each weapon to unlock everything on them, anything missing will show up in random BattlePacks by the time you you reach rank 100. This is for the original release weapons.
As some things are unlocked from random battlepacks you do not need to stay with the weapon past the 510 kills even if you still need battlepack obtained items for them. You will eventually get them regardless to the weapon you are using. Staying with the weapon longer will not speed that up.
So onces I get to the point on a weapon where the only things missing is battlepack items, that's 510 kills done then time to move on?
Well that's what I thought. Good to know. Thanks.