The Luth-AR A3 Stripped Upper Receiver (brand part number FTTEA) gives AR-15 builders a precision-machined foundation chambered for .223 Remington and 5.56 NATO. Luth-AR machines this A3 flattop receiver from a 7075-T6 aluminum forging and finishes it in hardcoat anodizing for a scratch-resistant, mil-spec-grade coating. It features an M4-type feed ramp, a 12-position Picatinny accessory rail for mounting optics or flip-up sights, a shell deflector, and a forward assist housing, and it comes ready to accept an ejection port cover. As a stripped receiver, it ships without a barrel, bolt carrier group, or internal parts, giving builders a clean starting point to assemble a custom upper exactly to spec.

Key Specifications

• Machined from 7075-T6 aluminum forging for a strong, mil-spec-grade receiver.
• Finished with hardcoat anodizing for a tough, scratch-resistant coating.
• Built as an A3 flattop configuration with a 12-position Picatinny accessory rail for optics or sights.
• Features an M4-type feed ramp for reliable feeding with M4-profile barrel extensions.
• Includes a shell deflector and forward assist housing as machined features of the receiver.
• Ready to accept an ejection port cover once the barrel and bolt carrier group are installed.

Frequently Asked Questions

Does this receiver include a barrel or bolt carrier group? No, this is a stripped upper receiver only; barrel, BCG, charging handle, and handguard are sold separately.

What rail system does it use? A 12-position Picatinny accessory rail on an A3 flattop profile for mounting optics or back-up iron sights.

What material is the receiver made from? 7075-T6 aluminum forging with a hardcoat anodized finish.

Buy the Luth-AR A3 Stripped Upper Receiver

Order the Luth-AR A3 stripped upper receiver from our Lubbock, Texas gun shop for fast, insured shipping. Browse more Luth-AR AR15 uppers to start your build.