Season 1 of Call of Duty: Modern Warfare 2 and Warzone 2.0 is live, and the inaugural season brings new weapons, operators, and more. Two of the season's weapons are found within the free tiers of the battle pass, but a third is unlocked through an in-game challenge. Here we'll guide you through unlocking the M13B assault rifle.

How to unlock the M13B assault rifle

The M13B is part of Modern Warfare 2's Bruen Ops weapon platform, and it is described as an assault rifle with a high rate of fire and low recoil.

It's unlocked by completing an in-game challenge in Warzone's DMZ mode, but Activision's blog post said it could also be purchased with a store bundle. At launch, this bundle was not available in the shop.