When professionals, hunters, and sportsmen demand the highest optical quality and Mechanical precision. US Optics is the solution. With a proprietary lens prescription and the durability to perform in the harshest conditions, no task is out of reach. Made out of 6061-T6 Aircraft grade aluminum, these optics are made to last a lifetime. With features such as locking turrets, zero stop, revolution counter, and tool-less elevation re-zeroing. the b- Series was designed with the shooter in mind..