The more critically I look at the video barrel installation the more it appears barrel fitting isn’t shown. The woman spins the barrel in until its shoulder contacts the frame. When she’s done the barrel has at least 45 degrees left to go and it looks more like 60 degrees. When the man checks barrel assembly then gives it a final turn with his frame wrench he only turns it a few degrees. It could be he’s finishing the installation of a different revolver’s barrel but I think barrel fitting wasn’t shown.