Mossberg 500. Forget pistol grip only option. Looks cool on tv, not so practical on the range. Collapsible stock keeps it short for indoor use, let’s you use a full stock on the range. May want to rethink shotgun though if you don’t live alone. May have situation where someone you care about is too close. Something with a little more precision may be a better choice.
Twenty years ago I would have used nothing but a standard stock unless concealability was important. If so I would have gone with a folding stock.
Since I have gotten arthritis pretty bad, I need a full pistol grip and also a complete rubberized butt stock and with a cushioned butt pad.
I had no intention of buying one of those hard rubberized pistol grip Until I used one and discovered it fit my arthritic hand far better that standard stock.