UPPER RECEIVER DETAILS:

MIL-Spec inner dimension measures at 1.000 -0.0/+0.002″

Finish – Clear Anodize*

-For Use with M4 Barrel extensions
-Assembled Upper Receivers come with ejection port cover and forward assist installed

LOWER RECEIVER DETAILS:

Our MIL-Spec Centurion Arms LLC, C4 5.56 Forged Lower Receiver with a clear anodized finish*

Receivers Machined from 7075-T6 Aircraft Grade Aluminum Forgings

*Let’s learn science!

Anodization Process:
The anodizing process involves immersing the aluminum in a solution and passing an electric current through it, which causes the aluminum to react and form a hard, durable oxide layer on its surface.

Clear Anodized:
“Clear” anodizing refers to the process where the oxide layer is left uncolored, allowing the natural metal aspects to shine through. With this type of aluminum, it results in a sheen that ranges from bright gold to a muted metallic.

Benefits:

• Enhanced Durability: The oxide layer significantly increases the aluminum’s resistance to scratches, wear, and corrosion.
• Corrosion Resistance: The protective layer helps to prevent the aluminum from oxidizing and rusting.

 Because of the clear finish, any defects or forging grains in the metal will be visible and  present a uniqueness for each receiver. All sales are final unless in the event of warranty claims based on the functionality of the receiver, not cosmetic preference.