Luth-AR Lo Drag Upper Receiver AR-15 Black. Hard coat Anodized Black. Designed to be lightweight without a forward assist shell deflector or dust cover. Thick wall for strength. Picatinny top rail. Specifications for Luth-AR Lo Drag Upper Receiver: Manufacturer: Luth-AR Color: Black Finish: Hard Coat Anodized Fabric/Material: 6061-T6 Aluminum Caliber: .223 Remington Gun Make: AR Platform Gun Model: AR-15 Condition: New Projectile Caliber: .223 Caliber Features of Luth-AR Lo Drag Upper Receiver Thick wall for added strength Picatinny top rail Package Contents: Luth-AR Lo Drag Upper Receiver What firearm models does the manufacturer say Luth-AR Lo Drag Upper Receiver is compatible with? The manufacturer suggests that Luth-AR Lo Drag Upper Receiver is compatible with AR-15Luth-AR UR-LDU: Lo Drag Upper Receiver AR-15 Black