Material: Upper receivers are commonly made from aluminum, often 7075-T6 aluminum, for a balance of strength and weight.
Finish: Stripped upper receivers come in various finishes, including anodized, Cerakote, or other coatings. The finish provides corrosion resistance and contributes to the overall aesthetics of the rifle.
Picatinny Rail: The upper receiver typically features a Picatinny or MIL-STD-1913 rail along the top. This rail allows for the attachment of optics, sights, and other accessories.
Forward Assist and Ejection Port Cover: Some stripped upper receivers may include a forward assist and ejection port cover, while others are "slick side" without these features. The decision to include or omit these components depends on the user's preference for a more streamlined appearance.
Flat-Top or A3 Style: AR-15 upper receivers may have a flat-top design (Picatinny rail extends to the end of the receiver) or an A3-style design (with a carry handle and integral rear sight). Stripped upper receivers are often flat-top for increased versatility.
Compatibility: Ensure that the stripped upper receiver is compatible with your specific AR-15 build. Factors such as the style (A1, A2, A3), caliber, and compatibility with your chosen handguard are important considerations.
Brands: Numerous manufacturers produce AR-15 stripped upper receivers, including Aero Precision, BCM (Bravo Company Manufacturing), Anderson Manufacturing, and many others. Different brands may offer variations in design, quality, and features.
Forged vs. Billet: Upper receivers are typically either forged or billet. Forged receivers are more common and are produced by forging and machining, while billet receivers are machined from a solid block of aluminum.
M4 Feed Ramps: Many modern upper receivers have M4 feed ramps to improve reliability, especially when using certain types of ammunition.
