Billet Upper Receiver Features 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. Billet Upper Receiver Specifications 7075 Billet Aluminum NO Forward Assist Low Profile Brass Deflector