AR-15 300 AAC BLK 14.5" Pistol Upper Assembly / 7" Fake Suppressor / M-LOK – Built for Precision and Style

Product Code:MAR-300-14-7-FAKE
Availability:In Stock
  • $299.95

  • $449.95

Available Options

AR-15 300 AAC BLK 14.5" Pistol Upper Assembly / 7" Fake Suppressor / M-LOK – Built for Precision and Style

AR-15 300 AAC BLK 14.5" Pistol Upper Assembly / 7" Fake Suppressor / M-LOK – Built for Precision and Style

Elevate your AR-15 pistol with the 300 AAC Blackout 14.5" Pistol Upper Assembly, designed by Moriarti Armaments (MA) for superior performance and aesthetic appeal. Crafted from high-quality USA-made components, this upper is the ideal upgrade for any firearm enthusiast seeking a dynamic, tactical look and performance.


Key Features:

  1. 14.5" Medium Profile Barrel – This 14.5-inch barrel is crafted from 41V50 CMV steel for exceptional durability and strength. The nitride-coated finish enhances corrosion resistance and provides a smooth, friction-reducing surface for longer barrel life. Ideal for tactical use and a great choice for 300 Blackout ammo.

  2. Chambered in 300 Blackout – Chambered in 300 AAC Blackout (300 BLK), this upper is perfect for a range of applications from home defense to recreational shooting. It provides versatility, supporting both subsonic and supersonic ammo.

  3. 1:7 Twist Rate – The 1:7 twist rate ensures optimal stabilization for a wide range of bullet weights, offering precision performance with both heavy and light projectiles.

  4. Fake Suppressor – The 7" 308/300 BLK Fake Suppressor not only enhances the aesthetic of your build but also serves a practical function by helping to reduce muzzle flash and give a more aggressive tactical appearance.

  5. M4 Feedramps & 5/8x24 Threads – The M4 feedramps ensure smooth feeding of rounds, while the 5/8x24 threads make it compatible with a variety of muzzle devices, offering customization options for muzzle brakes or other suppressor setups.

  6. A3 Flat-Top Upper Receiver – Constructed from 7075-T6 aluminum forgings, this upper receiver is hardcoat anodized to military specifications (Gov. specs). It includes a forward assist and dust cover for added functionality and durability.

  7. Pistol-Length Gas System – The pistol-length gas system is designed to provide optimal cycling performance for short-barrel rifles and pistols, ensuring reliability while minimizing recoil and enhancing overall control.

  8. 12" Slim M-LOK Handguard – Featuring a 12-inch slim M-LOK rail, this handguard is made from aircraft-grade aluminum and anodized in black for superior strength and corrosion resistance. The M-LOK system allows you to easily attach accessories like lights, lasers, and grips.


AR-15 300 AAC BLK 14.5" Pistol Upper Assembly Specs:

  • Weight: Lightweight design for easy handling and maneuvering.
  • Platform: AR-15
  • Chamber: 300 AAC Blackout
  • Barrel Material: 41V50 CMV Steel, Nitride Coated
  • Barrel Length: 14.5"
  • Barrel Twist: 1:7 RH Twist
  • Muzzle Device: 7" 308/300 BLK Fake Suppressor
  • Muzzle Threads: 5/8x24
  • Gas System: Pistol Length, Low Profile Gas Block (.750 Diameter)
  • Handguard: 12" M-LOK Free Float Rail
  • Upper Receiver: A3 Flat-Top, 7075-T6 Aluminum, Black Hardcoat Anodized
  • Finish: Black Anodized

What's Included:

  • Complete 14.5" Pistol Upper Assembly with 7" Fake Suppressor and 12" M-LOK Handguard

Note: Does not include BCG or Charging Handle. These can be purchased separately.


This upper assembly is designed to drop directly onto your Mil-Spec AR-15 lower receiver, allowing you to quickly enhance your firearm with no additional modifications required. Perfect for enthusiasts seeking to build a custom pistol with a unique look, optimized performance, and 300 Blackout versatility. Images may not represent the exact product.

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