If you upgrade your knife and you're playing multiplayer with someone and that person is down, you can knife the person or shoot a knife and that person gets revived.
to upgrade your self
The Afterburner
Everything!
yes yes you can
No.
you upgrade the ammo by pack a punching your weapon it should costs $5000 to pack a punch which will upgrade your weapon and ammunition
no
you can't !hope I helped!
It means you can upgrade your guns.
Well, the upgrade for Call of Duty Black Ops got released on May 1st, so it will be more popular for a while.
Scavenger Or Scavenger Pro
disco stick