SOIDC DOC Complete Upper Receiver 5.56


The SOIDC DOC Upper stands as a testament to meticulous craftsmanship and innovative design. With the MD Enhanced Bolt Carrier Group, Radian Charging handle, and a host of features designed for precision and reliability, this upper receiver sets a new standard for excellence in the world of firearms.

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SOIDC DOC Upper Receiver Overview

Upper Receiver:

  • Construction: The billeted upper receiver is crafted with precision, featuring exacting tolerances that ensure a flawlessly flat barrel face for perfect alignment. The reduced barrel seat size necessitates thermal fitting, which enhances the precision fit and significantly boosts repeatable accuracy.
  • Coating: Protected with E Series Cerakote atop type 3 anodizing, this coating not only gives the upper receiver a sleek look but also plays a crucial role in reducing wear on parts and increasing corrosion resistance, thereby extending the rifle’s lifespan and reliability.


  • Caliber: .223 Wylde (5.56/.223)
  • Connection: Features a Thermal Fit Barrel connection that establishes a rock-solid bond between the barrel and the upper, ensuring enhanced accuracy and minimizing bolt wear, which bolsters the firearm’s overall dependability.
  • Specifications: At the core of the rifle is a 16-inch Proof Research carbon fiber barrel, known for its extreme rigidity and low heat retention. This barrel maintains its position even under high temperatures and cools rapidly, ensuring consistent accuracy. It comes with a Sub MOA accuracy guarantee, with potential for 1/2 MOA accuracy in skilled hands.
  • Gas System: The mid-length gas system provides improved control by reducing felt recoil and muzzle rise, allowing for quicker follow-up shots.


  • Charging Handle: Includes an MD-marked Radian ambidextrous charging handle, enhancing ease of use and versatility.
  • Bolt Carrier Group: The MD-enhanced Bolt Carrier Group is coated in ArmorLube, which reduces friction and contributes to the rifle’s exceptional functionality.


  • Design: The 15-inch handguard is equipped with Mlok slots at 3, 6, 9, and 45-degree intervals, offering extensive space for mounting accessories.
  • Stability Features: Anti-rotational tabs and a patented retention system ensure that the handguard remains securely in place, even under strenuous conditions.

Muzzle Device:

  • Type: The firearm is completed with an A2 Birdcage muzzle device, which contributes to its overall functionality and design.


The SOIDC Doc Upper Receiver is a testament to advanced engineering and meticulous design, blending cutting-edge features to deliver a superior shooting experience. This upper receiver is characterized by enduring accuracy, enhanced control, and reliable performance, making it an excellent choice for shooters seeking a high-quality, precision-engineered firearm component.

Additional information


E series Cerakote on top of Type 3 Hardcoat Anodized


16 inch Proof Research Carbon Fiber 1:7.5 twist


MD Thermal fit billet upper


15 in with Mlok at 3,6,9 as well as the 45s, anti rotational tabs, Patented retention system.

Charging Handle

MD Marked Radian Raptor Ambi

Gas system

Mid Length

Gas block

Non Adjustable


Black, FDE, Jungle Green


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