Shorty DOC Complete Upper Receiver QUAD 5.56


The Shorty DOC Upper receiver, featuring the MD Enhanced Bolt Carrier Group and Radian Charging handle, embodies precision and reliability in compact design.

Available on backorder

Category: SKU: 40003


  • Shorty Doc Upper Receiver

    • The meticulously crafted billeted upper receiver serves as the cornerstone of this exceptional firearm, exemplifying a commitment to precision through exacting tolerances. Its flawlessly flat barrel face ensures impeccable alignment, while the reduced barrel seat size demands thermal fitting for a precision fit, thus elevating repeatable accuracy to new heights.
    • The marriage of aesthetics and durability is embodied in the E Series Cerakote, layered atop type 3 anodizing. This strategic coating not only extends the rifle’s longevity but also significantly diminishes wear and boosts corrosion resistance, fortifying the upper receiver’s overall robustness.


    • The Thermal Fit Barrel-to-Upper connection establishes a rock-solid bond, anchoring the barrel securely in place, guaranteeing precision, and minimizing wear to the bolt.
    • The 10.3-inch CrMov barrel, featuring a 1:7 twist and QPQ nitride finish, epitomizes heightened durability, ensuring longevity and exceptional performance.
    • Carbine Length gas system, this configuration optimizes performance and reliability under various conditions, making it an adaptable and reliable choice for a range of shooting scenarios.
    • The seamless synergy between the barrel and gas system enhances overall efficiency, offering a superior shooting experience across diverse situations.


    • Enhancing overall functionality, the MD-marked Radian ambidextrous charging handle introduces versatility and ease of use.
    • The MD-enhanced Bolt Carrier Group, coated in ArmorLube, actively reduces friction, contributing to the firearm’s overall efficiency.
    • The 9.5-inch handguard, designed with picatinny rails on all four sides for a quad rail layout, offers ample real estate for accessories. Anti-rotational tabs and a patented retention system ensure unwavering handguard placement, even under the most rigorous usage.
    • Concluding this comprehensive ensemble is the A2 Birdcage muzzle device
    •  Now you see the Shorty Doc Upper Receiver demonstrates unwavering commitment to precision. In its entirety, this firearm epitomizes meticulous craftsmanship, innovative design, and cutting-edge features, setting an unparalleled standard for excellence in the realm of firearms

Additional information


E series Cerakote on top of Type 3 Hardcoat Anodized


10.3 CrMov Steel finished in QPQ nitride 1:7 Twist


MD Thermal fit billet upper


9.5 in quad rail, anti rotational tabs, Patented retention system.

Charging Handle

MD Marked Radian Raptor Ambi

Gas system

Carbine Length

Gas block

Non Adjustable, Pinned


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