Odin Works, 9MM Billet Upper Receiver, 9MM, Black, Fits AR-15, NO Forward Assist, Low Profile Brass Deflector WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 7075 Billet Aluminum NO Forward Assist Low Profile Brass Deflector When accuracy, perfection, and reliability matters, ODIN Works Billet Upper will give you a distinct advantage. Designed without a forward assist and including a low profile brass deflector, you won't blend in with everyone else on the range. Made out of 7075-Billet Aluminum, the single stock of extruded aluminum allows for tighter tolerances, ensuring better accuracy and reliability.