Call of duty

How to build 15 secret weapons in Modern Warfare: AK74u, M16, more

by Albert Petrosyan
Infinity Ward

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Call of Duty: Modern Warfare players have figured out a way to use the in-game Gunsmith feature to build weapons that are technically not available in the game.

Weapons along with gunplay have been the main focus of every Call of Duty title, and Infinity Ward managed to take that to a whole new level with Modern Warfare.

Not only are the guns in MW as realistic as can be, they all also have dozens of attachments that each offer their own pros and cons, with players being able to equip up to five on each weapon.

It did not take long for players to figure out that certain combinations of attachments actually make a profound difference on some guns – essentially turning them into almost completely different weapons that aren't available in the game.

In total, there are 15 of these "secret" weapons that can be created, many of which are classic guns from past Call of Duty titles.

You can find the exact attachments needed for each one below, courtesy of Reddit user 'HeyoItsMrMayo.' It's important to note that some of these won't be exact replicas of their versions from past CoD games, but they are still very similar in appearance and function.

Colt 9mm SMG

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: M4A1 assault rifle
  • Required attachments:
    • Barrel: FFS 11.5" Commando Barrel
    • Stock: FORGE TAC CQS Stock
    • Ammunition: 9mm Para 32-Round Mags
    • Remaining 2 attachments can be anything of your choice

AR 15.50 assault rifle

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: M4A1 assault rifle
  • Required attachments:
    • Barrel: Corvus Custom Barrel
    • Stock: Singuard Arms Invader Stock
    • Ammunition: .458 SOCON 10-Round Mag
    • Remaining 2 attachments can be anything of your choice

MCX SBR (Rattler)

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: M13 assault rifle
  • Required attachments:
    • Barrel: Tempus Cyclone Barrel
    • Stock: FFS Close Quarters Stock
    • Ammunition: .300 Blackout 30-Round Mags
    • Remaining 2 attachments can be anything of your choice

RPK light machine gun

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: AK-47 assault rifle
  • Required attachments:
    • Barrel: 23.0" RPK Barrel
    • Stock: Field LMG Stock
    • Underbarrel: Bipod
    • Ammunition: 75 Round Drum Mags
    • Remaining attachment can be anything of your choice

AK-74u SMG

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: AK-47 assault rifle
  • Required attachments:
    • Barrel: 8.1" Compact Barrel
    • Stock: Skeleton Stock
    • Ammunition: 5.45 x 39mm 30-Round Mags
    • Remaining 2 attachments can be anything of your choice

AK-12 assault rifle

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: AK-47 assault rifle
  • Required attachments:
    • Barrel: Spetsnaz Elite Barrel
    • Stock: FORGE TAC Ultralight Stock
    • Ammunition: 5.45 x 39mm 30-Round Mags
    • Remaining 2 attachments can be anything of your choice

Steyr AUG light machine gun

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: AUG SMG
  • Required attachments:
    • Barrel: 622mm Long Barrel
    • Optic: Integral 3.0x Optic
    • Ammunition: 5.56 NATO 30-Round Mags
    • Remaining 2 attachments can be anything of your choice

MP5/10 SMG

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: MP5 SMG
  • Required attachment:
    • Ammunition: 10mm Auto 30-Round Mags
    • Remaining 4 attachments can be anything of your choice

MP5SD

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: MP5 SMG
  • Required attachment:
    • Ammunition: Subsonic Integral Suppressor
    • Remaining 4 attachments can be anything of your choice

MP5K SMG

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: MP5 SMG
  • Required attachments:
    • Muzzle: Tactical Suppressor
    • Barrel: FFS Mini Barrel
    • Stock: FTAC Collapsible Stock
    • Underbarrel: Ranger Foregrip
    • Remaining attachment can be anything of your choice

M16 assault rifle

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: M4A1 assault rifle
  • Required attachments:
    • Barrel: Stock m16 Grenadier Barrel
    • Stock: M-16 Stock
    • Perk: Burst
    • Remaining 2 attachments can be anything of your choice

RPD light machine gun

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: AK-47 assault rifle
  • Required attachments:
    • Barrel: 23.0" Romanian Barrel
    • Stock: Field LMG Stock
    • Ammunition: 75 Round Drum Mags
    • Remaining 2 attachments can be anything of your choice

LSW light machine gun

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: SA87 LMG
  • Required attachments:
    • Barrel: SA87 25.4" Factory Barrel
    • Stock: FFS SA87 Heavy Stock Pro
    • Underbarrel: Bipod
    • Ammunition: 60-Round Mag
    • Remaining attachment can be anything of your choice

M21 sniper rifle

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: EBR-14 marksman rifle
  • Required attachments:
    • Barrel: 22.0" FORGE TAC Precision Barrel
    • Optic: Sniper Scope
    • Stock: FFS Raider Chasis Elite Stock
    • Underbarrel: Bipod
    • Ammunition: 20-Round Mag

FN SCAR PDW

Infinity Ward / 'HeyoItsMrMayo' - Reddit
Infinity Ward / 'HeyoItsMrMayo' - Reddit

  • Base weapon: FN SCAR 17
  • Required attachments:
    • Barrel: FORGE TAC CQC Pro Barrel
    • Stock: FTAC Collapsible Stock
    • Remaining 3 attachments can be anything of your choice

There you have it - 15 "secret" weapons you can make in Modern Warfare using the Gunsmith feature that otherwise aren't available as options in the regular weapon menus.

Also, make sure to check out all of our other weapon guides for MW: