The Aero Precision M4E1 300BLK Assembled Upper is a testament to precision engineering and design excellence. Featuring a 16" barrel and a sleek anodized finish, this upper receiver offers a robust platform for AR-15 builds. Its M-LOK handguard provides ample space for attachments, enhancing versatility and user customization. Ideal for range shooting and training, the M4E1 300BLK is crafted for reliability and performance. Aero Precision is renowned for its innovative designs and commitment to quality, making this upper a top choice for enthusiasts.

Key Features:
- Manufacturer: Aero Precision
- Model: M4E1 300BLK
- Caliber: .300 AAC Blackout
- Barrel Length: 16"
- Gas System Length: Pistol
- Finish: Anodized Black
- Handguard: 15" M-LOK
- Muzzle Thread: 5/8x24
- Weight: 4.5 lbs
- Includes port door and forward assist