The CMMG Upper Receiver Assembly for Mk4/AR15 Armor Black is expertly crafted from aircraft-grade aluminum, ensuring a robust and durable build. This assembly features a ZEROED Polymer Dust Cover pre-installed and omits the forward assist, providing a sleek and stylish base for new AR15 builds. Ideal for range time, competition, and training, this upper receiver is compatible with various pistol calibers and lower receivers, making it a versatile choice for firearm enthusiasts. CMMG is renowned for its innovative designs and commitment to quality, ensuring a reliable and high-performing product.

Key Features:
- Manufacturer: CMMG
- Model: Mk4/AR15
- Product Type: Upper Receiver Assembly
- Material: Aircraft-grade Aluminum
- Unique Features: ZEROED Polymer Dust Cover, Omitted Forward Assist
- What's In The Box: Upper Receiver Assembly