In this video, Julia Steel is at the range testing a Colt AR-15 from the P3 Ultimate Shooting Rest and Gun Vise from CTK Precision.
This unit can actually be purchased as a shooting rest, or as a gun vise. You can then add the optional gun vise attachment or shooting rest attachment. My suggestion… buy the entire unit! This is a piece of equipment that I use often, for both shooting and gun maintenance.