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



Product Information

Cartridge 5.56x45mm NATO
Finish Black Parkerized
Material Aluminum
Barrel Length 10.3 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 4150 Chrome Moly Vanadium Steel
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

Delivery Information

Shipping Weight

4.720 Pounds

Product Overview

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.

Made In United States of America

WARNING: Cancer and Reproductive Harm –


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