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.

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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.

• Read More: New classic DLC weapons leaked in Modern Warfare

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.

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Colt 9mm SMG

• 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

• 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)

• 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

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RPK light machine gun

• 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

• 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

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AK-12 assault rifle

• 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

• 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

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

MP5SD

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

MP5K SMG

• 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

• 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

• 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

• 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

• 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

• 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:

• 5 best MP5 classes and loadouts
• 5 best Overkill classes and loadouts
• 5 best M4 classes and loadouts
• Best quick-scoping classes
  
• How to unlock all Operators
  
• How to get free in-game items by watching Twitch
  
• How to lean while aiming
  
• How to unlock Gold, Platinum, and Damascus weapon camos

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