By installing nova 3
Accuracy or max damage one.
Yes you can! In multiplayer there is a perk called bling that lets have two attachments.Hope this helps,Commander.
In Multiplayer; Only one except if you have warlord ( Warlord is a perk that allows you to have 2 attachment on your gun)
the best class to use is your favourite smg with silencer and stinger as your secondary and perk 1 sleight of hand perk 2 asassin perk 3 stalker
Use the Warlord perk.
The closest you can get to having infinite ammo without cheating is using the one man army perk(unlocked at level 45), when you are running low simply use one man army.
Use a machine gun, tier 1 perk Scavenger or tier 1 perk One Man Army.
Perk 1: Marathon Pro Perk 2: Stopping Power Pro Perk 3: Commando, Snipers - Steady Aim Pro.
Tombstone is a new Perk-A-Cola in Zombies. Each use costs 2000 Points. This perk drops a tombstone wherever you may have died, preserving the last weapons you held. Once you come back to life in the next round, you can grab your weapons from the tombstone.
When you reach level 38 you wil unlock the Overkill perk. You can use thi perk as your second perk and it allows you to use two primary weapons
use bling perk whuich u get at about level 21-ish
if in cod 6 make a class with a stinger perk 1 scavenger perk 2 COLD BLOODED and perk 3 watever. equipment use tac insertion.