How to unlock the M16 in Warzone Unlocking the M16 won’t take long at all, and you might already have it available if you’ve been playing Warzone for a while. All you need to do is rank up to level 10, either in Cold War, Warzone, or both. By logging in with the same account, you’ll be able to carry over your progress and unlocks from each game and use your M16 with all the bells and whistles you’ve already gained. Best M16 loadout in Warzone The M16 is a brutal gun when it comes to damage. Here, I’ve put together a couple loadouts and attachment combinations to help you get the best out of the M16, including a mid-range assault build and a close-quarters build to rival SMGs. If you hit your shots right, you can kill an enemy in just two bursts with this brilliant weapon, so take your pick.