AR-40 .40 S&W 4" Micro Pistol Parts Kit – M-LOK, Spider Engraved Dust Cover, Choose Color

.40 S&W Micro Pistol Kit: Specs & Features

The AR-40 40 S&W 4" Micro Pistol Parts Kit from Moriarti Armaments offers all the essential components for building your custom AR-40 pistol chambered in 40 S&W. This kit is designed to provide exceptional performance with a 4" barrel featuring a 1:16 twist and a 40 S&W BCG, making it perfect for self-defense, target shooting, and recreational use. Built with mil-spec components made in the USA, the AR-40 kit delivers superior durability, reliability, and accuracy.

The kit comes with a spider web-engraved dust cover to add a custom aesthetic touch to your build, as well as color options to personalize your firearm. With a 7.5 oz buffer and blowback gas system, it ensures smooth cycling and optimal recoil management, making it a top choice for enthusiasts and marksmen alike.

Kit Includes:

• 40 S&W 4" Barrel: Precision-made 4150 CMV M4 Profile barrel, chambered in 40 S&W, with a 1 in 16” twist for reliable accuracy in a compact design. Blowback operation.
• Thread: 5/8X24 thread for compatibility with various muzzle devices.
• Gas Block: Blowback system for smooth cycling and reduced recoil.
• Upper Receiver: Forged 7075-T6 M4 Upper Receiver with hard coat anodizing, forward assist, and ejection port cover.
• Dust Cover: Spider Web Engraved Dust Cover for added aesthetic appeal.
• Handguard: 4" M-LOK Free Float Handguard for improved accuracy and versatility.
• Bolt Carrier Group (BCG): 40 S&W BCG with M16 cut, chrome-lined, and phosphate finish, MPI tested for durability.
• Charging Handle: Standard AR-15 charging handle for smooth cycling.
• Lower Parts Kit (LPK): AR-15 Mil-Spec Lower Parts Kit (lower receiver not included).
• Buffer Assembly: 7.5 oz AR-15 Pistol Buffer Assembly with spring and foam for optimal cycling and recoil control.

Color Bundle Set Options: Choose from a variety of premium Cerakote colors for your build:

• Burnt Bronze:
  • AR-15 Stripped Upper Receiver - Burnt Bronze Cerakote
  • AR-15 M-Lok 4" Super Slim Free Float Handguard - Burnt Bronze
• Flat Dark Earth (FDE):
  • AR-15 Stripped Upper Receiver - FDE Cerakote
  • AR-15 M-Lok 4" Super Slim Free Float Handguard - FDE
• OD Green:
  • AR-15 Stripped Upper Receiver - OD Green Cerakote
  • AR-15 M-Lok 4" Super Slim Free Float Handguard - OD Green
• Robins Egg:
  • AR-15 Stripped Upper Receiver - Robins Egg Cerakote
  • AR-15 M-Lok 4" Super Slim Free Float Handguard - Robins Egg
• Pink:
  • AR-15 Stripped Upper Receiver - Pink Cerakote
  • AR-15 M-Lok 4" Super Slim Free Float Handguard - Cerakote Pink
• Red:
  • AR-15 Stripped Upper Receiver - Red Cerakote
  • AR-15 M-Lok 4" Super Slim Free Float Handguard - Cerakote Red
• Hunter Orange:
  • AR-15 Stripped Upper Receiver - Cerakote Hunter Orange
  • AR-15 4" Combat M-Lok Handguard - Cerakote Hunter Orange "C" Cut
• Bright White:
  • AR-15 Stripped Upper Receiver - Cerakote Bright White
  • AR-15 4" Combat M-Lok Handguard - Cerakote Bright White "C" Cut
• Lemon Zest:
  • AR-15 Stripped Upper Receiver - Cerakote Lemon Zest
  • AR-15 4" Combat M-Lok Handguard - Cerakote Lemon Zest "C" Cut
• Zombie Green:
  • AR-15 Stripped Upper Receiver - Cerakote Zombie Green
  • AR-15 4" Combat M-Lok Handguard - Cerakote Zombie Green "C" Cut

Important Notes:

• 80% Stripped Lower Receiver Not Included: The kit does not come with a lower receiver, but an 80% stripped lower receiver can be purchased separately.
• No FFL Required: This kit is not an FFL item, meaning no federal firearms license is needed for purchase or transfer.

FAQ

Is a lower receiver included?

No. The kit ships without a lower receiver, so you complete it on your own lower. Check your state rules before ordering.

What lower does it fit?

A dedicated pistol-caliber AR lower, such as a Glock-pattern lower using .40 S&W Glock-style magazines. A standard AR-15 lower with 5.56 magazines will not feed it.

How does it operate?

It is a direct blowback system, so it has no gas tube. A heavy PCC buffer is used for reliable cycling.

Related: .40 S&W Micro ARP · all Micro ARP pistols and uppers

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