Cmmg Upper Receiver Assembly For Mk4/ Ar15 Armor Black

Building or rebuilding an AR-15? A quality upper receiver assembly is the foundation of a reliable platform, and the CMMG Upper Receiver Assembly for Mk4/AR15 in Armor Black gives you a proven starting point. Built from aircraft-grade aluminum, this upper comes ready to go with a ZEROED polymer dust cover already installed—so you skip that assembly step and get straight to customizing your rifle the way you want it.

The forward assist is omitted on this model, giving the upper a cleaner profile and letting you build exactly the platform you're after. Whether you're putting together a lightweight carbine, a long-range precision setup, or just want a spare upper to swap between lower receivers, this CMMG assembly handles the job. The armor black finish resists corrosion and blends with most modern furniture and rail systems.

CMMG has earned a solid reputation for quality AR components that run reliably in the field and at the range. This upper receiver assembly reflects that standard—it's manufactured to tight tolerances and designed to pair with any standard AR-15 lower receiver and compatible bolt carrier group.

Key Features

• Aircraft-grade aluminum construction for durability and weight efficiency
• ZEROED polymer dust cover pre-installed and ready to use
• No forward assist—clean aesthetic for custom builds
• Armor black finish for corrosion resistance
• Compatible with standard AR-15/Mk4 lower receivers

Specifications

Frequently Asked Questions

Will this upper receiver work with my AR-15 lower?

Yes, this CMMG upper receiver assembly is compatible with any standard AR-15 or Mk4 lower receiver. Simply pair it with your preferred lower and bolt carrier group to complete the rifle.

What comes pre-installed on this upper?

The upper arrives with a ZEROED polymer dust cover already installed, saving you assembly time and reducing the number of parts you need to source separately.

Why is there no forward assist on this model?

The forward assist is omitted to provide a cleaner, more streamlined profile for builders who prefer a minimalist upper or who don't need that feature for their intended use.

What's the armor black finish made for?

The armor black finish is durable, resists corrosion, and provides a professional appearance that coordinates well with modern rail systems and tactical furniture on most AR builds.