Griffin Armament AR-15 Patrol Pistol Upper Receiver Assembly 14.5″ 223 Remington (Wylde)


Category: Product ID: 19021


Griffin Armament’s MK1 Upper offers premium features and reliability to each user and allows end users to configure their upper to fit their needs. The Griffin HEDP Barrels provide High Endurance Dual Purpose functionality- offering high durability and precision accuracy. Nitride 416R stainless steel provides the highest possible hardness and longest throat life available with match grade bore dimensions and bore finish. HEDP barrel bores are hand lapped, ensuring batch to batch consistency and accuracy. True-bore concentric suppressor grade threads provide an optimized thread interface for your silencer regardless of brand or model. M4 feed ramps and chambers are polished prior to nitriding for smooth reliable feeding, chambering, and extraction. Gas ports were carefully engineered to provide reliable function suppressed or unsuppressed with 5.56 NATO ammunition. M4A1 contour diameter between the chamber and gas block for minimal POI shift with suppressors and maximum accuracy and durability while maintaining field weight.

The Griffin Low-Pro RIGID rails are a slim, low profile, ultralight, yet rigid M-LOK rail. Design objectives of this rail were to provide a slim, ultralight rail, with increased rigidity over similar weight and profile current market options. A custom extrusion provides significant internal reinforcement to reduce flex when gripping the carbine firmly in the shoulder pocket. Understanding the importance of low light targeting, these reinforcements provide rigid mounting for IR laser aimers ensuring minimal POI shift when torque is applied to fore-grip type accessories, or when loads are applied to the rail (shooting off barricades, loaded bipods etc). Internal testing showed 70% less POI shift with laser aimers versus competing “slim rails”. Carefully positioned slots in the rail allow for rapid cooling when running the carbine fast while maintaining rigidity.


  • 416R SS barrel manufactured from stress relieved certified barrel steel
  • Black nitride for extended service life
  • Magnetic particle inspected
  • Button rifled
  • 223 Wylde chamber for optimal accuracy
  • Mid length gas for softer recoil characteristics
  • .750″ gas block journal
  • M4A1 diameter for reduced POI shift / Increased Accuracy & Durability
  • Air gauged and hand lapped bore
  • Polished chamber and M4 feed ramps
  • Pinned and welded muzzle device
  • Product Information

    Cartridge 223 Wylde
    Finish Black Nitride
    Material Aluminum
    Barrel Length 14.5 Inches
    Threads 1/2″-28
    Barrel Contour M4
    Sights Yes
    Barrel Finish Nitride
    Gas Block Diameter 0.75 Inches
    Gas System Length Mid-Length
    M4 Feed Ramps Yes
    Upper Receiver Type A4 Flat-Top
    Barrel Material 7075 Aluminum
    Handguard Griffin Low-Pro Rigid
    Bolt Carrier Assembly Included Yes
    Muzzle Device Griffin Silencer Mount Muzzle Device
    Mil-Spec or Commercial Mil-Spec
    Country of Origin United States of America
    Compatible With

    Delivery Information

    Shipping Weight 5.650 Pounds


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