Colt AR-15 Upper Receiver Assembly 5.56x45mm 16″ Barrel Monolithic Rail


Category: Product ID: 18899


The Colt AR-15 Upper Receiver Assembly with Monolithic Rail comes complete with charging handle, bolt and bolt carrier assembly. Featuring a flat-top upper receiver with picatinny rail, this assembly is more than ready to offer the shooter maximum versatility when it comes to mounting accessory devices. Unique to this upper receiver, is the free float monolithic rail which is machined together in conjunction with the upper receiver portion of the upper assembly. The monolithic rail presents the user with an extremely versatile single plane rail which eliminates the chance of front mounted accessories being canted or unlevel. The Colt Upper Receiver also feature a free-floating barrel which is designed to enhance accuracy and target acquisition.


  • Monolithic Rail
  • Free-Floating Barrel
  • Flat Top Upper
  • A2 Flash Hider
  • Black Parkerized Finish
  • Flip-Up Rear Sight
  • Product Information

    Cartridge 5.56x45mm NATO
    Finish Black Parkerized
    Material Aluminum
    Style Monolithic Free Floating
    Barrel Length 16 Inches
    Twist 1:7 Inches
    Threads 1/2″-28
    Barrel Contour M4
    Sights Yes
    Barrel Finish Black Parkerized
    Chrome Lined Yes
    Gas Block Diameter 0.75 Inches
    Gas System Length Carbine
    M4 Feed Ramps Yes
    Upper Receiver Type A3 Flat-Top
    Barrel Material Chrome Moly Vanadium Steel
    Handguard Free Float Monolithic
    Bolt Carrier Assembly Included Yes
    Muzzle Device A2 Flash Hider
    Mil-Spec or Commercial Mil-Spec
    Compatible With

    Delivery Information

    Shipping Weight 5.415 Pounds


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