AR-15 5.56/.223 16" Gov t Profile BLACK SHARK Upper Assembly / MLOK

Product Code:MAR-556-16-12-SHARK
Availability:In Stock
  • $249.95

  • $399.95

Available Options

5.56 NATO/.223 Wylde

AR-15 5.56/.223 16" Gov't Profile BLACK SHARK Upper Assembly / MLOK

AR-15 5.56/.223 16" Gov't Profile "BLACK SHARK" Upper Assembly with MLOK

Upgrade your AR-15 build with the AR-15 5.56/.223 16" "BLACK SHARK" Upper Assembly. Designed for precision and durability, this upper assembly combines high-performance materials and top-tier craftsmanship. Perfect for shooters seeking reliability, accuracy, and a stylish design, the "BLACK SHARK" Upper comes with a sleek 12" slim profile MLOK handguard, ensuring a lightweight yet durable build for both tactical and recreational shooting.


Key Features:

  • Caliber: 5.56 NATO – Compatible with both 5.56 NATO and .223 Remington ammunition for versatile performance.

  • Barrel:

    • Length: 16”
    • Profile: Government profile for optimal balance and accuracy.
    • Material: 4150 Chrome Moly Vanadium steel, heat-treated for superior strength and wear resistance.
    • Finish: Nitride finish for increased durability and corrosion resistance.
    • M4 Feed Ramps ensure reliable feeding and cycling of ammunition.
    • Gas Block Diameter: .750” for consistent gas flow.
  • Gas System: Carbine-length gas system for optimal reliability and smooth cycling, even in tough conditions.

  • Twist Rate: 1/7 button rifled twist for superior accuracy with heavier bullets, making this upper ideal for a wide range of 5.56 NATO ammunition.
  • Muzzle Device:

    • Custom Steel Shark Muzzle Brake (4”): Threaded 1/2x28 to reduce recoil and muzzle rise, ensuring faster follow-up shots and enhanced control.
  • Handguard:

    • 12” Slim Profile MLOK Rail – Free-floating, anodized black for superior ergonomics and mounting versatility. The MLOK slots offer easy attachment of accessories while maintaining a lightweight, balanced design.
  • Upper Receiver:

    • A3 Flat Top Upper Receiver – Made from certified 7075-T6 aluminum forgings, this receiver is precision machined and black hardcoat anodized to military specifications for maximum durability.
    • Forward Assist & Dust Cover installed for added reliability and to keep your firearm functioning in harsh environments.

Additional Information:

  • Does Not Include BCG or Charging Handle – These components are sold separately but can be purchased alongside the upper assembly.

  • Perfect for Custom Builds: Whether you’re assembling your AR-15 from scratch or upgrading an existing rifle, this "BLACK SHARK" Upper Assembly offers everything you need for precision shooting and ultimate performance.

  • Made in the USA: Crafted using only the finest materials and manufacturing standards to ensure long-lasting quality and dependability.


Why Choose the "BLACK SHARK" Upper Assembly?

  • Precision Engineering: Each component is crafted to meet strict military specifications, ensuring consistent, reliable performance.
  • Enhanced Muzzle Control: The custom shark muzzle brake helps control recoil and muzzle rise, improving shooting accuracy.
  • Durability and Strength: The 7075-T6 aluminum upper receiver and nitride finished barrel ensure long-term resilience, withstanding the toughest conditions.
  • Customization Ready: The 12” MLOK rail offers superior customization for accessories, giving you the flexibility to tailor your rifle to your specific needs.

Included Components:

  • 16” Government Profile Barrel (4150V steel, nitride finish, M4 feed ramps)
  • 12” Slim Profile MLOK Free Float Handguard (anodized black)
  • A3 Flat Top Upper Receiver (7075-T6 aluminum, hardcoat anodized)
  • Forward Assist & Dust Cover (installed)

Note: This upper assembly does not come with a Bolt Carrier Group (BCG) or Charging Handle, but these can be purchased separately. Images may not be the exact representation of the product.


Whether you're building your AR-15 from the ground up or looking to upgrade your current setup, the AR-15 5.56/.223 16" "BLACK SHARK" Upper Assembly is your go-to choice for performance, reliability, and durability.

Ricky 04/21/2023

Processing took a while and it showed up beautifully packed. Will be shooting it later today.

Eddie 04/21/2023

Processing took a while but it showed up looking great. Will be shooting it later today.

Marcos 07/20/2020

Just picked up one of these to pair with an older S&W M&P-15. M&P Lower and BCG/CH fit and function perfectly with this upper. Was only able to test it at 25 yards so far, but 30 rounds made a single ragged hole. Very happy so far!

Wayne 09/11/2018

Appears to be a nice upper build. Shoots well with no jams or feed problems. Looks - good, Works - well. I only shoot brass case ammo, so no problems with the 40 rounds I put down the range. Nice tight fit to my lower.

Wayne 09/11/2018

Bought this awhile back. Put it on an existing lower and took to the range....with temporary open sights. Shot very well at 50-100 yrds. Have not had time to put it on a bench rest to try grouping, but was able to hit tin cans at 100 yrds with open sights. No jams, no problems..... but used only brass cased ammo. Quality build. Would buy again.

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Tags: ar-15, 5.56/.223, 16", gov, profile, black, shark, upper, assembly, mlok 16" 16"

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