M4e1 Upper Receivers Complete 5.56mm

M4E1 Upper RECEIVERS Complete 5.56MM

Cartridge: AKK_5.56 mm Nato
Color: Black
Finish: Anodized
Length: 18''
Make: AR-15
Make/Model: AR-15
Style: Complete
Twist: 1-7


Manufacturer: Aero Precision
Model: The M4E1 Upper Receivers Complete in 5.56mm are fully assembled upper receiver assemblies designed for AR-15 rifles chambered in the 5.56x45mm NATO cartridge. These complete upper receivers typically include various components that are ready to be attached to a lower receiver to create a functional AR-15 rifle. Here's more information about them:

AR-15 Compatibility: These complete upper receivers are specifically designed for AR-15 rifles chambered in 5.56mm, which is a popular and widely used caliber for AR-15-style rifles.

Fully Assembled: The "complete" designation indicates that the upper receiver is fully assembled and includes all the necessary components for the upper half of the rifle. This typically includes the barrel, handguard, gas system, and other essential parts.

M4E1: The "M4E1" may refer to a specific model or design within the manufacturer's product lineup. It could include specific features or enhancements unique to this model.

Upper Receiver: The upper receiver is the top part of the AR-15 rifle and includes components like the barrel, handguard, gas block, and flash hider. It does not include the lower receiver, which is the serialized part of the AR-15 and requires an FFL (Federal Firearms License) transfer.

5.56mm Chambering: The 5.56mm chambering is versatile and allows the use of both 5.56x45mm NATO and .223 Remington ammunition. This makes the complete upper receiver compatible with a wide range of ammunition.

Installation: Installing a complete upper receiver onto an AR-15 lower receiver is a straightforward process and typically involves attaching the two parts using pins and takedown screws.

Manufacturer Variations: Various manufacturers offer complete upper receivers, each with unique designs, features, and compatibility with different AR-15 lower receivers.

Accessories: Some complete upper receivers may include accessories like sights, handguards, or flash hiders, depending on the manufacturer and model.