Shorty DOC Complete Upper Receiver QUAD


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

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Shorty DOC Complete Upper Receiver QUAD Overview

Upper Receiver:

  • Construction: The billeted upper receiver is precision-engineered to exacting tolerances, featuring a flawlessly flat barrel face for impeccable alignment. This meticulous design ensures enhanced accuracy and a precision fit due to thermal fitting of the reduced barrel seat size.
  • Coating: Finished with E Series Cerakote over type 3 anodizing, this strategic dual-layer coating not only enhances the aesthetic appeal but also extends the longevity of the rifle by reducing wear and increasing corrosion resistance.


  • Connection: Features a Thermal Fit Barrel-to-Upper connection that creates a rock-solid bond, minimizing wear to the bolt and enhancing the firearm’s stability and accuracy.
  • Material and Finish: The 10.3-inch barrel is made from CrMov steel with a QPQ nitride finish, offering exceptional durability and performance.
  • Twist Rate: The barrel has a 1:7 twist rate, ideal for stabilizing a wide range of bullet weights.
  • Gas System: Equipped with a carbine length gas system for 5.56 NATO and a pistol length system for 300 BLK, optimizing performance and reliability across various shooting conditions.


  • Charging Handle: Equipped with an MD-marked Radian ambidextrous charging handle, enhancing the firearm’s versatility and ease of use.
  • Bolt Carrier Group: The MD-enhanced Bolt Carrier Group is coated in ArmorLube, which significantly reduces friction, thereby improving the overall efficiency and reliability of the firearm.


  • Design: The 9.5-inch handguard features a quad rail layout with Picatinny rails on all four sides, providing extensive space for mounting a wide range of accessories.
  • Stability Features: Includes anti-rotational tabs and a patented retention system that ensures the handguard remains securely in place, even under extreme conditions.

Muzzle Device:

  • Type: The firearm is completed with an A2 Birdcage muzzle device, adding to its functional and aesthetic qualities.


The Shorty Doc Upper Receiver QUAD stands as a testament to the unwavering commitment to precision and excellence. This upper receiver combines meticulous craftsmanship, innovative design, and advanced features to set a new standard in firearm engineering. It offers unparalleled accuracy, performance, and reliability, making it an exceptional choice for discerning shooters who demand the best in terms of functionality and durability in diverse shooting environments.

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


5.56 NATO, 300 BLK


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