Aero Precision's M4E1 300BLK Assembled Upper Receiver showcases superior engineering with a 10" .300 Blackout barrel, anodized finish, and threaded muzzle. Designed for AR-15 rifles, it offers precision machining and enhanced features like M4 feedramps and a full top Picatinny rail for attachments.

Ideal for range time and training, this upper receiver is praised for its build quality and performance. Aero Precision is renowned for innovation and reliability in firearm components.

Key Features:
- Manufacturer: Aero Precision
- Model: M4E1 300BLK
- Caliber: .300 Blackout
- Condition: New
- Action: Semi-Automatic
- Finish Color: Anodized Black
- Barrel Length: 10"
- Number of Magazines: Not Included
- Capacity: Not Specified
- Optic Footprint: Not Specified
- Unique Features: Enhanced forging with "billet look"
- Night Sights: No
- External Safety: No
- Threaded Barrel: Yes
- What's In The Box: Upper Receiver, Handguard
- Weight: 21 oz
- Length: Not Specified
- Width: Not Specified