Thanks to Birchwood Casey, you never have to stop customizing your rifles. The Birchwood Casey AR-15 Upper Receiver Vise Block installs to the upper receiver on standard AR-15s and like firearms, allowing users to position the barrel and torque it down to the receiver with minimal effort. Included snap pits engage fully with the receiver, while the precision-molded construction ensures a precise fit. Clamps securely into any vise to make routine cleaning and assembly quick and convenient. Plus, you can rest assured that the soft-jaw design won't scratch or mar the receiver while you work.