I use a Ar-15 Carbine length under my bed for HD. It has a sure-fire attached to it, so target identification won't be a problem. The Ar-15 uses .223's which--surprisingly penetrate less than say, a .45. For me, that's personal choice, I feel more sure of my aim and more in control of the AR than holding a pistol or shotgun. It's also extremely easy to switch from 'Safe' to 'fire.'
The problem with shotgun is that the BATFE has seen it fit to classify any barrel less than 18" on a shotgun as an Short-Barreled Rifle, requiring paperwork to shorten the length of it. Personally, the 18" barrel makes it somewhat harder for me to maneuver, but it's individuals choice (no stock?). The shotgun's an assured man stopper though.
I'm not happy with my pistol for HD, as I feel unstable holding it with a flashlight in the other hand.
Eitherway, so long as you have a gun for HD, be sure to have a dependable flashlight too--wouldn't want to shoot your roomate returning home late.
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