Aero Precision's M4E1 .300 Blackout Assembled Upper Receiver is a marvel of engineering, designed with precision and quality in mind. Featuring a 16" barrel with a pistol-length gas system, this upper receiver is perfect for range time and training. The anodized black finish and M-LOK handguard enhance its durability and ease of use. Aero Precision is renowned for its innovative designs and commitment to quality.

Key Features:
- Manufacturer: Aero Precision
- Model: M4E1
- Caliber: .300 Blackout
- Condition: New
- Action: Semi-Automatic
- Finish Color: Anodized Black
- Barrel Length: 16"
- Number of Magazines: Not Included
- Capacity: Not Applicable
- Optic Footprint: Not Included
- Unique Features: M-LOK Handguard, Pistol-Length Gas System
- Night Sights: No
- External Safety: No
- Threaded Barrel: Yes
- What's In The Box: Upper Receiver Only
- Weight: 29 oz
- Length: Not Specified
- Width: Not Specified