Lantac USR Forged Upper Receiver.
The LANTAC USR Forged AR15 Stripped Upper Receiver (01-RV-UP-USR-SF15) is machined from 7075-T6 and has above Mil-Spec features while retaining a traditional look. The USR (Upper Standard Receiver) receiver features a raised pad behind the front lug to facilitate a tighter receiver fit. A radiused cam pin recess is added to further reduce cam pin ravel wear. The barrel extension area is deliberately undersized for better barrel fit and accuracy.