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It seems as though some of Call of Duty: Modern Warfare 2's weapons are going to be tied to its alternative game modes, as the new Bruen M13B carbine is locked behind a DMZ-specific activity. With the Season 1 content already available for download a few hours ahead of its release, players are poring through MW2's interfaces and files to discover all the new content that's coming to the game, with new weapons being a notable point of interest.
In keeping with established franchise tradition, Call of Duty: Modern Warfare 2 is seemingly going to continue adding a number of new weapons every season. Season 1, specifically, includes the fictionalized version of the Sig MCX weapons platform, with the M13B and Chimera assault rifles, as well as the BAS-P submachine gun. These will also be joined by the Victus XMR sniper rifle, though it sits as a standalone firearm with no additional platform choices.
According to the game's UI, players will need to jump into Modern Warfare 2's DMZ mode if they wish to unlock the M13B assault rifle. Specifically, it seems like the only way to unlock this weapon will be to defeat the "Chemist" character in DMZ, who may or may not be a boss encounter of some sort. The game doesn't list any alternative ways of getting the weapon, though it's possible that they will be visible later on. Furthermore, players that purchase a store bundle with a variant of the M13B may also end up getting the baseline weapon.
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Though some may recall that the Sig MCX family was rumored to be one of Modern Warfare 2's launch-day weapon platforms, Infinity Ward seems to have postponed its release to include it as part of Season 1 content instead, launching on November 16. The BAS-P SMG, curiously, was present in a few of the single-player campaign's later missions, usually seen in the hands of Alejandro Vargas. Similarly, Ghost could sometimes be seen using the internally suppressed Chimera carbine.
Some claim that Modern Warfare 2's weapon unlocks are needlessly complicated since players now need to rank up every individual weapon to be able to use their respective parts and attachments. While there may be some merit in that claim, it's also interesting to note that Infinity Ward is moving weapons around from one platform to another, confusing knowledgeable players. Namely, while the Chimera is now included as part of the Bruen Ops M13B weapon platform, its real-world counterpart has nothing to do with the Sig MCX.
This, of course, is likely just a way for Infinity Ward to keep things interesting and varied, as well as to flex Modern Warfare 2's evolved Gunsmith feature. Once unlocked and fully maxed out, players are free to mix and match their weapons however they see fit, as long as the parts are sensibly interchangeable.
Call of Duty: Modern Warfare 2 is available now on PC, PS4, PS5, Xbox One, and Xbox Series X/S.