Box art - Call of Duty: Modern Warfare

Modern Warfare Secret Weapons | How to get RPK, MCX, M16, and more

Call of Duty: Modern Warfare (2019) has a nifty hidden feature that allows players to use the Gunsmith to manufacture weapons otherwise unavailable in-game. By fiddling with attachments it’s possible to drastically change how a firearm functions. Choose the right set of a attachments and you can make almost entirely different guns. Below you’ll find all the possible Modern Warfare secret weapons and how to build them.

How to build all Modern Warfare secret weapons

Modern Warfare secret weapons

Firstly, it’s worth noting that you’ll need to max level (or near enough) a lot of the following guns in order to unlock all of the attachments required to transform them. After doing that, head to the Gunsmith menu for any of the applicable weapons and deck them out as follows in order to unlock all of the hidden Modern Warfare guns.

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Over on Reddit, user HeyoItsMrMayo compiled a list of recommended loadouts. While the ammo types may not be exactly correct, the behavior of each weapon is pretty spot on. Highlights include the RPK and MPX, which are actually viable guns that do well in-game.

How to build the RPK

  • Take the AK-47 assault rifle
  • Equip the following attachments:
    • Barrel — 23″ RPK
    • Stock — Field LMG
    • Underbarrel — Bipod
    • Ammo — 75-Round Drum Magazine

 How to build the MCX SBR (Rattler)

  • Take the M13 assault rifle
  • Equip the following attachments:
    • Barrel — Tempus Cyclone
    • Stock — FFS Close Quarters
    • Ammo —  .300 Blackout 30-Round Magazine

How to build the M16

  • Take the M4A1 assault rifle
  • Equip the following attachments:
    • Barrel — Stock M16 Grenadier
    • Stock — M-16
    • Perk — Burst

How to build the Colt 9mm SMG

  • Take the M4A1 assault rifle
  • Equip the following attachments:
    • Barrel — FFS 11.5″ Commando
    • Stock — FORGE TAC CQS
    • Ammo — 9mm Para 32-Round Magazine

How to build the AR 15.50

  • Take the M4A1 assault rifle
  • Equip the following attachments:
    • Barrel — Corvus Custom
    • Stock — Singuard Arms Invader
    • Ammo — .458 SOCOM 10-Round Magazine

How to build the AK-74u

  • Take the AK-47 assault rifle
  • Equip the following attachments:
    • Barrel — 8.1″ Compact
    • Stock — Skeleton
    • Ammo —  5.45×39mm 30-Round Magazine

How to build the AK-12

  • Take the AK-47 assault rifle
  • Equip the following attachments:
    • Barrel — Spetsnaz Elite
    • Stock — FORGE TAC Ultralight
    • Ammo — 5.45×39mm 30-Round Magazine

How to build the Steyr AUG

  • Take the AUG SMG
  • Equip the following attachments:
    • Barrel — 622mm Long
    • Optic — Integral 3.0x
    • Ammo — 5.56 NATO 30-Round Magazine

How to build the MP5/10

  • Take the MP5 SMG
  • Equip the following attachments:
    • Ammo — 10mm Auto 30-Round Magazine

How to build the MP5SD

  • Take the MP5 SMG
  • Equip the following attachments:
    • Muzzle — Subsonic Integral Suppressor

How to build the MP5K

  • Take the MP5 SMG
  • Equip the following attachments:
    • Muzzle — Tactical Suppressor
    • Barrel — FFS Mini
    • Stock — FTAC Collapsible
    • Underbarrel — Ranger Foregrip

How to build the RPD

  • Take the AK-47
  • Equip the following attachments:
    • Barrel — 23.0″ Romanian
    • Stock — Field LMG
    • Ammo — 75-Round Drum Magazine

How to build the LSW

  • Take the SA87 LMG
  • Equip the following attachments:
    • Barrel — SA87 25.4″ Factory
    • Stock — FFS SA87 Heavy Stock Pro
    • Underbarrel — Bipod
    • Ammo — 60-Round Magazine

How to build the M21

  • Take the EBR-14 marksman rifle
  • Equip the following attachments:
    • Barrel — 22.0″ FORGE TAC Precision
    • Optic — Sniper Scope
    • Stock — FFS Raider Chasis Elite
    • Underbarrel — Bipod
    • Ammo — 20-Round Magazine

How to build the FN Scar PDW

  • Take the FN Scar 17 assault rifle
  • Equip the following attachments:
    • Barrel — FORGE TAC CQC Pro
    • Stock — FTAC Collapsible

In all cases, any remaining attachment slots can be outfitted as you see fit. This means that many of the Call of Duty: Modern Warfare secret weapons can be customized further to meet your personal playstyle, presenting a whole new world of possibilities when it comes to building your loadout. With some players being unaware of the hidden guns that can be crafted using the Gunsmith, this could provide an edge in combat as it’s hard for them to prepare for the unknown.

The above is a list of Modern Warfare secret weapons that are currently available in the game. Of course, with additional weapons presumably being added as the game matures, new secret weapons may be added. We’ll be sure to update our list if this happens.

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