I got a good friend in Columbus, Ohio who is a expert in Judo I'll ask him about it. I am sure if your are with in arms lenght of each other a Judo expert could disarm you in the blink of an eye. If theres 8' or 10' he better be real good is all I can say. Most of these punks never make it through judo schools and such. It's a lot of work to get really good at.
Before my deployment, I used to keep an M4gery available for home defense. I vastly prefer the M4 to a shotgun for HD. It's shorter and far more ergonomic, kicks much less, is much faster to shoot accurately, and holds far more ammo. With light JHPs (I used 50 grain Federals), overpenetration on a human target is not a concern. Wall penetration is a concern with any ammo that will put a deep enough hole in a person, shotguns included.
Room clearing with an M4 is no big deal, even though Mas Ayoob makes it out to be the most dangerous thing in the world. In urban ops training here at Bragg, I cleared dozens of rooms with an M4. It wasn't any harder than doing it with a pistol, and the M4 is so much more effective than a pistol that comparisons are ridiculous.
Racking a pump shotgun to scare the guy is generally bad policy. If you're going to shoot the guy, shoot him and be done with it. If seeing your gun doesn't scare him away, loading it probably won't either. Anyway, ARs make nice clickity-clack noises when loaded, too.
An "M4" in 9mm gives you most of the advantages of the design, but lacks the power of the .223 round. However, if the range you have available only allows pistol ammo, your decision is made for you.
All that said, I am very likely selling my AR when my deployment ends. An 18-round Glock pistol seems ample for house defense.
Talked to my buddy in Columbus who is a judo expert and he says there has to be a pause for him to react and that it's only good from about 7 to 10'. Then he could disarm about 95% of the people. Without the pause you still better be a good shot or get lucky. The pause he is talking about is only 1 to 2 seconds. If someone is in my house I am shooting on site.
He does not compete anymore but is still a referee at many national matches in the USA and Canada.
What bullets are well suited for human-sized targets in .223? I thought that the HP's would only be good for varmints. I have some 60gr Hornady V-Max bullets for varmints but didn't think it wise for use against larger targets. For everything else I have M885 62gr bullets. Am I wrong?