Product Code: 5D-16-18-M4-P-M4

16" AR-15 Upper - Parkerized M4 Contour Barrel, 1:8 Twist, M4 Carbine Handguard


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This is a perfect option for builders who wish to utilize receiver mounted optics or who plan to upgrade to a free floating handguard at a later date.


A quality and budget friendly complete AR-15 16" upper assembly brought to you by 5D Tactical. These M4 upper receivers are built in-house by expert builders with over 40 years of experience. Each barrel is visually inspected and cleaned prior to assembly. All barrel nuts are torqued to proper specifications per Mil-Spec standards and practices. Every complete M4 upper assembly is QC inspected and headspace checked before shipment. As completed M4 carbine upper receiver assemblies are not considered firearms, no FFL is required. Ships directly to your home.

  • Barrel length - 16"
  • Twist Rate - 1:8
  • Caliber - 5.56 NATO or .223 Remington (.223 Wylde)
  • Barrel Profile - M4 Contour
  • Barrel Type - 4150 Chrome Moly Vanadium - Parkerized Finish
  • Gas System - Carbine Length, .750" diameter steel micro gas block
  • Handguard - M4 Carbine Style Drop-In w/ Heat Shields
  • Forward Assist and Dust Cover installed
  • Muzzle Device - A2 Style Birdcade or Compact Muzzle Brake
  • BCG/Charging Handle not included - Selection Options to Add
  • MIL-A-8625 Type III Class 2 Black Hardcoat Anodized

*Buyer is responsible for configuring finished rifle build in accordance with their local and state laws.