Agree with everyone. If he is just going to shoot it occasionaly A glock is the LAST gun I would suggest because of the possibility of accidents with that trigger mechanism. Yes I know there are plenty of folks who LOVE their glocks but then they are the same people who shoot them regularly and are familiar with them. A Double Action revolver is a lot safer for someone who isn't going to practice a lot with it. Suggest a 6 inch barrel if he is going to use it for occasional shooting at the range. For home defence, there is no problem with a longer barrel.
One other point, it's EASY to see if a revolver is unloaded. Forgetting there is one in the chamber after the magazine has been dropped has resulted in more than one unexpected BANG