Aero Precision's M4E1 5.56 Assembled Upper Receiver with the ATLAS S-ONE Handguard is a testament to superior design and engineering. This complete upper receiver is crafted for the AR-15 platform, featuring a robust 18-inch 5.56 NATO barrel with a 1:7 twist rate, ensuring precision and reliability. The anodized black finish adds durability and a sleek look, while the M-LOK attachment system offers versatility for accessories.

Ideal for competitive shooting, hunting, and target practice, this upper receiver is a favorite among enthusiasts for its lightweight design and quality construction. Aero Precision is renowned for its innovation and commitment to quality, making it a trusted name in the firearms industry.

Key Features:
- Manufacturer: Aero Precision
- Model: M4E1 5.56 Assembled Upper Receiver
- Caliber: 5.56 NATO
- Condition: New
- Action: Semi-Automatic
- Finish Color: Anodized Black
- Barrel Length: 18.00"
- Number of Magazines: N/A
- Capacity: N/A
- Optic Footprint: N/A
- Unique Features: Enhanced forging for a "billet look", M-LOK attachment system
- Night Sights: No
- External Safety: No
- Threaded Barrel: Yes
- What's In The Box: Assembled Upper Receiver, ATLAS S-ONE Handguard
- Weight: 4.280 lbs
- Length: 18.000 inches
- Width: N/A