Is the AR pistol a potential HD weapon, yes.
"
Potentially"? Yes. See my previous post. They
potentially are good home defense weapons. Universally? Commonly? No.
Those unfamiliar with it's use are the only ones questioning it.
Careful making blanket statements like that. Some of us pointing out the pitfalls have plenty of experience with them. Lack of understanding is NOT why some of us hesitate to recommend them. In fact, quite the opposite.
Ok, let's talk about them.
Short length - they average about 26" and that's an advantage in a 30" hallway ...
Not many 30" wide hallways out there. Building code doesn't allow that.
And an average "M4-gery" has a collapsed length only 3" longer than your average 26" guess. So that's really not that big a deal.
High capacity - no doubt a duty/service double stack handgun carries a lot - up to 19 rounds. And it is the first line of what I still consider to be a failed outer defense. An AR pistol? 30-60 rounds depending on mag capacity. Or more with a light six mag chest harness.
Do we really believe -- even a little bit -- that 30-60 rounds and a flippin' chest harness of six more mags is something that's a realistic requirement for average Joe (non-coke-dealing) homeowner to defend the split-level rancher? You know, most folks sleep mighty well with an old 870 and 5-7 shells on tap. Let's not get hung up on making home-defense look like combat, or be a gear race.
Firepower - with that much ammo you can put down a hail of suppressive fire to allow your family to move out the back door - or a safe room that you have made intruder proof and bullet proof. It lacks either quality - just get out. Suppressive fire is as easy as pulling the trigger repeatedly, and if you want even more, a binary trigger can double the rate of fire. It's the legal version of full auto - which the military SBR's have used from day one.
Good heavens! You're talking about using SUPPRESSIVE FIRE in a civilian, peace-time, defensive shooting? Did I miss a "winky" smiley somewhere?
5.56 - your choice of cartridge is out there, .300BO and 6.8SPC are just two alternates. Nonetheless, 5.56 has advantages - cheap practice ammo and proven MK262 which is the preferred service round in the MK18/CQBR. It's 70 gr OTM with advanced low flash powder and what a team would use boarding ships or clearing an apartment. That team could very well be YOUR local SWAT team coming it to clean out the intruders. It's interesting to consider that while some think the AR pistol is inadequate the police prefer it when possible as the go to gun for rescuing homeowners. They have the inexpensive privilege of retaining the stock, is all.
But cartridge is -- really, truly, seriously, come-on-now-we-know-this-right? -- pretty darned irrelevant in defensive shootings. 5.56 works, and might have decent non-penetration characteristics, but it's nothing to get even a little hung up about. 9mm works. .45 ACP works. 12 or 20 gauge shells work. And the differences in what they accomplish, if they get to the target, are pretty darned equivalent. Cartridge debates are pretty juvenile, though they're mainstay staples of forums and gun counters, of course.
Ease of use - this should be a no brainer, if you shoot an AR, then the same controls in the same place will help under stress in a violent situation.
And without a stock, those controls are much less friendly to use. Compared to a stocked rifle or a handgun, "running" a stockless AR pistol is an awkward affair indeed. It isn't how the gun was designed to work with the human body.
The AR is easy to reload - the bolt hold open is a major advantage. You don't have to rack it with a loaded mag inserted, only to discover the mag falling out because the catch didn't quite engage. Weapons that require you to rack a gun with the mag inserted are not professional grade for a very good reason in the first world. We can afford better more advanced designs.
What are you comparing it against? What common service handguns DON'T hold the bolt open on an empty mag?
And, have you ever done a tactical reload of your AR (or anything else)? Was the bolt open? No? Hmmm. Seems like a tempest in a teapot.