LUTH-AR A1 Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver (UR-01-E3-SA)

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LUTH-AR A1 Stripped Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver For M16 (UR-01-M16)

Luth-AR Stripped NC15 Forged Upper Receiver, Manufactured from 7075-T6 Aluminum, Hard-Coat Anodized, Features Upper Picatinny Rail for Mounting Optics and Accessories FTT-EA

DANIEL DEFENSE M4A1 5.56mm 14.5in Barrel Flat Dark Earth Upper Receiver (23-004-13150)

LANTAC USA DMR AR-15 .223 Wylde 18in Black Anodized Complete Upper Receiver (01-FA-223-DMR-UPR)

RADIAN WEAPONS Model 1 .223 Wylde 10.5in Black Complete Upper Receiver (R0023)

RADIAN WEAPONS Model 1 .223 Wylde 14.5in Black Complete Upper Receiver (R0024)