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.

Available on backorder

Category: SKU: 40004


  • SOIDC DOC Upper Receiver

    • Precision is paramount in the design of the billeted upper receiver, meticulously crafted to exacting tolerances. This upper boasts a flawlessly flat barrel face, maintaining perfect alignment with the upper. The reduced barrel seat size requires thermal fitting, promoting a precision fit that significantly increases repeatable accuracy.
    • Adding to its durability is the E Series Cerakote, applied on top of type 3 anodizing. This coating not only imparts a sleek appearance but also serves a crucial functional role, substantially reducing wear on parts and increasing corrosion resistance. These features, in turn, contribute to the rifle’s longevity and sustained reliability.


    • A Thermal Fit Barrel connection further enhances this rifle’s reliability, creating a rock-solid bond between the barrel and upper. This connection not only ensures accuracy but also minimizes wear to the bolt, reinforcing the firearm’s dependability.
    • At the heart of this impressive firearm is the 16-inch Proof Research carbon fiber barrel. Engineered for extreme rigidity and reduced heat retention, this barrel remains steadfast even in high-temperature conditions. The result is a barrel that doesn’t shift when hot and cools off rapidly, maintaining accuracy. With a Sub MOA guarantee and the potential for 1/2 MOA in the hands of a skilled shooter, this barrel exemplifies precision.
    • The Mid-Length gas system enhances control, reducing felt recoil and muzzle rise for faster follow-up shots.


    • The MD-marked Radian ambidextrous charging handle
    • MD-enhanced Bolt Carrier Group, coated in ArmorLube, contribute to the rifle’s exceptional functionality.
    • The 15-inch handguard, equipped with Mlok at 3, 6, 9, and 45-degree intervals, provides ample space for accessories. Anti-rotational tabs and a patented retention system ensure the handguard stays securely in place, even during rigorous use.
    • The A2 Birdcage muzzle device completes this meticulously designed firearm.
    • In its entirety, the SOIDC Doc Upper Receiver represents a harmonious blend of cutting-edge features, delivering a superior shooting experience characterized by enduring accuracy, control, and reliability.

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


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