Aero Precision's M4E1 5.56 Assembled Upper Receiver with the ATLAS S-ONE Handguard is a testament to superior design and engineering. Featuring a lightweight build with a slim profile, this upper receiver includes an 11.5" carbine barrel made from aircraft-grade aluminum and anodized for a durable finish. It is designed for seamless compatibility with mil-spec AR15 receivers and barrels, ensuring ease of use and reliability.

Ideal for range time and training, the M4E1 5.56 Upper Receiver offers precision and lightweight handling. Aero Precision is renowned for its innovation and quality craftsmanship, making it a trusted choice among firearm enthusiasts.

Key Features:
- Manufacturer: Aero Precision
- Model: M4E1 5.56 Assembled Upper Receiver
- Caliber: 5.56 NATO
- Condition: New
- Action: Semi-Automatic
- Finish Color: Black Anodized
- Barrel Length: 11.5"
- Number of Magazines: Not Included
- Capacity: Not Applicable
- Optic Footprint: Not Included
- Unique Features: Lightweight, Slim Profile, Aircraft Aluminum
- Night Sights: No
- External Safety: No
- Threaded Barrel: Yes
- What's In The Box: Upper Receiver, Handguard
- Weight: 4 lbs
- Length: 11.5"
- Width: Not Specified