I know that relatively recently, Tom Selleck ripped an extra on the set of Blue Bloods a new one because of improper firearms handling.
Today, I'm watching Magnum P.I. and notice that even during a firefight, Thomas keeps his finger off of the trigger unless he's actually firing. And he's careful not to point his firearm at a non-combatant either. Funny how you become more aware of the little things and kudos to Mr. Selleck for walking his talk, even when acting, even back in the day.
5 months ago