Designed for today's popular pistol-caliber carbines, this ODIN Works 9mm Billet Upper Receiver does away with the forward assist that's not needed for these blowback-operated guns. The upper receiver also features a trimmed down brass deflector, which contributes to a clean look that'll give you a minimalist platform that has everything you need and nothing you don't. The receiver ships with no internal parts, providing AR builders with a blank canvas to build a perfect pistol-caliber carbine.