Aero Precision's M4E1 5.56 Assembled Upper Govt 18'' BBL Rifle Threaded Black showcases precision engineering and high-performance features. The 18-inch 5.56 NATO barrel and ATLAS R-ONE M-LOK handguard ensure exceptional accuracy and modularity, finished in anodized black for durability.

Ideal for range time and training, this upper receiver is praised for its reliability and innovation. Aero Precision is renowned for its quality craftsmanship and commitment to excellence.

Key Features:
- Manufacturer: Aero Precision
- Model: M4E1
- 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 with "billet look", M4 Feedramps
- Night Sights: No
- External Safety: No
- Threaded Barrel: Yes
- What's In The Box: Upper receiver, ATLAS R-ONE M-LOK handguard
- Weight: 67 oz
- Length: 18"
- Width: N/A