Modern Warfare 3 M13B Best Loadout Build MW3 - Modern Warfare 3

The M13B is a type of Assault Rifle weapon in Call of Duty: Modern Warfare 3 (MW3). Check here for complete info on the best loadouts and attachments of the M13B, as well as its stats and how to use this weapon!

Platform: Bruen Ops
Weapon Class: Assault Rifle
Max Level: 20
Magazine Capacity: 30
Reserve Ammo: 60
How to Unlock Unlocked by defeating the Chemist in the Radiation Zone of DMZ and extracting with his dropped weapon.

Modern Warfare 3 M13B

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Do all weapons in Modern Warfare II and their Blueprints carry forward to Modern Warfare III?


All Modern Warfare II weapons will be available for Modern Warfare III players, although each weapon’s associated unlock challenge must be completed before it becomes accessible in MWIII. Any Blueprints also carry forward, and certain MWII Blueprints available via Store Bundles will also be available to purchase in MWIII.

Some Base MWII weapons were available for a limited time during MWII’s Seasons of content, and are initially inaccessible to MWIII owners, unless the specific Weapon Unlock Challenge for that weapon has been completed.

To reiterate: If you haven’t played MWII and pick up MWIII, the full complement of MWII weapons will be available, but only after the associated weapon challenges in MWIII are completed.

Therefore, Modern Warfare III players should expect the following Base weaponry accessible in the Gunsmith, at launch:

  • An extensive and impressive number of Modern Warfare III–specific Base weapons (not revealed yet).
  • The Base weapons available at the launch of Modern Warfare II at the level you progressed them to in MWII. If you do not own MWII, the same MWII Base weapons will be available in MWIII, ready to be unlocked via a challenge, and leveled up.
  • Any Base weapons unlocked during a MWII Season, Event, or other unlock challenge (e.g., the Tonfa Base Melee weapon, available only as part of the Vondel Event in Season 04).

MW3 Weapons Gunsmith Carry Forward

Example 1: The Base M13B Assault Rifle (above) is available to obtain only during DMZ, after defeating the Chemist boss character (or defeating another player carrying the Base M13B) and exfilling with the weapon. If obtained in this manner, the Base M13B becomes available to use (and level up) in MWII and MWIII.

MW3 Weapons Gunsmith Carry Forward

Example 2: The Blueprint M13B Assault Rifle “Naughty” (above) is available to obtain only via the Store Bundle “Tracer Pack: Klaus Operator.” If purchased in MWII, the Blueprint (but not the Base) M13B becomes available to use (and level up) in MWII and MWIII.

Weapon Stats

Modern Warfare 3 M13B Weapon Stats

Best M13B Class Build

Weapon Loadout
Primary M13B
Secondary P890 / X12
Tactical Stun Grenade
Lethal Semtex / Molotov Cocktail
Base Perk 1 Double Time
Base Perk 2 Scavenger
Bonus Perk Hardline
Ultimate Perk Quickfix
Field Upgrade Trophy System

Best M13B Attachment Loadout

Barrel 14″ Bruen Echelon
Underbarrel Commando Foregrip
Ammunition 5.56 High Velocity
Rear Grip Bruen Flash Grip

How to Play

This loadout for the M13B is an assault class best used in small-scale game modes such as Team Deathmatch, Domination, or Kill Confirmed. The M13B’s solid damage output and fire rate combo is great for picking up easy frags, granting the player early killstreaks to help win the game.

The attachments for this loadout further increases the range and accuracy of the M13B, making it just as deadly in long range encounters. With the 5.56 High Velocity ammunition, the M13B’s damage output also increases to ensure frags from any range.

When running this build, it is recommended for players to take up advanced positions in the map and play aggressively to maximize the firepower of the M13B.

Progression Tree: All Unlockables

All Unlockables
This section is under construction.

NOTE: Newly acquired weapons will have locked attachment slots at Level 1. Category Unlocks are upgrades that unlock these attachment slots for use.

Guns Unlocked by Leveling the M13B

All Gun Unlocks
The M13B does not unlock any guns.

All M13B Camos

Camo Challenge Lv. Unlock
Tarnished Get 50 kills with the M13B 2
Field Ops Get 10 double kills with the M13B 9
Projectile Get 15 point blank kills with the M13B 15
Ice Cave Get 15 kills from behind with the M13B 19
Gold M13B Get 3 kills without dying 10 tiimes with the M13B N/A
Platinum M13B Get 25 longshot kills with the M13B N/A
Polyatomic M13B Get 25 headshot kills with the M13B N/A
Orion M13B Complete 51 polyatomic camo challenges N/A

All M13B Blueprints

This section is under construction.

Guides & Tips