The Birchwood Casey Upper Receiver Vise Block in Gray is an essential tool for securely holding your firearm's upper receiver in place during maintenance and assembly, ensuring precision and stability for all your gunsmithing needs. Mounts onto the upper receiver of standard AR15 or similar rifles Securely attaches to any vise, providing convenient access for cleaning and assembly Precision-engineered using CNC technology for accurate fitment The design of the soft jaw prevents any damage to the receiver Features snap pins to ensure a secure connection with the receiver Enables the user to install and securely torque the barrel to the receiver