The Luth-AR .223/5.56 A3 Flattop Upper Receiver Assembly provides a complete foundation for your AR build featuring precision machining from 7075-T6 aluminum forging and a durable hardcoat anodized black finish.Luth-AR Upper Receiver Assembly - .223/5.56 caliberFully assembled with charging handle includedA3 flattop design with 12-position Picatinny accessory railM4-type feed ramp for reliable feedingShell deflector forward assist and ejection port cover7075-T6 aluminum forging constructionHardcoat anodized black finish for scratch resistancePerfect for AR rifle builds this complete upper receiver assembly eliminates the need for separate component installation while providing mounting options for scopes optics and flip-up sights on the integrated Picatinny rail system.