And that's where I stopped reading. The guy might know a thing about different shotguns but he doesn't know anything about staying alive. If you care to scare some intruder away then do it with your voice. The weapon should have the safety off and the front sight on the intruder's center mass. If I'm within sound range of an intruder, I'm not going to be fumbling around trying to chamber a round. It's stupid tactics and shows how little the author knows. It will get you killed.
The piece was about choosing the right tool for the right job, not about home defense combat tactics. As I said in the piece I've never been in a circumstance where I needed to defend myself in my home.
I would welcome the opportunity to learn from others more knowledgeable than myself and invite them to author something themselves so all of us can benefit from their knowledge.
If a home invader hears the click-clack of my shotgun, it means that I somehow managed to miss with the first shot.
The little champagne-bottle *POP!* from the igniter cartridge of an M2A1-7 flamethrower makes a pretty good attention-getter, too. I doubt that most of those who've heard one just a little too late to do much of anything about it knew exactly what it was, but had at least SOME idea that it was not a sign of Good News.
If you face a threat don't tip anyone off. Racking a slide will only give your position away. Get away if possible. If not stay silent and deadly.