Colt AR-15 Pistol Upper Receiver Assembly 5.56x45mm Monolithic Rail


Buy Colt AR-15 Pistol Upper Receiver Assembly 5.56x45mm Monolithic Rail Online

Colt Firearms


Buy Colt AR-15 Pistol Upper Receiver Assembly 5.56x45mm Monolithic Rail Online

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 plenty of picatinny slots that 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 features 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


Note the design of the rear sight may vary as Colt production specifications change. Current uppers are being received with either Magpul or MaTech style adjustable flip-up rear sights. Buy Colt AR-15 Pistol Upper Receiver Assembly 5.56x45mm Monolithic Rail Online


Cartridge 5.56x45mm NATO
Finish Black Parkerized
Material Aluminum
Barrel Length 11.5 Inches
Barrel Material 4150 Chrome Moly Vanadium Steel
Barrel Finish Black Parkerized
Twist 1:7 Inches
Threads 1/2″-28
Barrel Contour M4
Sights Yes
Chrome Lined Yes
Gas Block Diameter 0.75 Inches
Gas System Length Carbine
M4 Feed Ramps Yes
Upper Receiver Type A3 Flat-Top
Handguard Monolithic
Bolt Carrier Assembly Included Yes
Muzzle Device A2 Flash Hider
Mil-Spec or Commercial Mil-Spec
Country of Origin United States of America
Compatible With



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Colt is now a subsidiary of the Czech holding company, Colt CZ Group. Colt has been instrumental in the engineering, production, and marketing of firearms, especially between the 1850s and World War I. The company played a major role in popularizing the revolver and shifting away from single-shot pistols. Although Samuel Colt did not invent the revolver concept, his designs resulted in the first very successful model.

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Colt has been influential in shaping the landscape of firearms manufacturing, known for its innovative designs and significant contributions to the evolution of the revolver. The company’s commitment to engineering excellence is evident in its iconic products, such as the Colt Walker, the Colt Single Action Army, the Colt Python, and the Colt M1911 pistol—the latter being the longest-standing military and law enforcement service handgun in the world

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Colt was also primarily responsible for all AR-15 and M16 rifle production, as well as many derivatives of those firearms. The most successful and famous of these are numerous M16 carbines, including the Colt Commando family, and the M4 carbine.

Colt Firearms
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