I think this would be a highly individual decision, and each individual will have to try several firearms to see what works for them.
In all seriousness, a Taurus Judge may be the best option for him.
Is he still living at home? Because nursing homes would likely frown on handguns.
Check this link out. It's titled “Handguns for Handicapped and Very Recoil Sensitive Shooters “
The Beretta 84 (I have one) is a tough slide to actuate. Requires quite a bit of muscle. The trigger is pleasant though. If he has a fanny pack, I would suggest the KelTec P30 .22magnum pistol.
It’s weight, easy of function and day-bright sighting would be my vote. Also, .22 mag comes in some pretty devasting rounds. It’s comparable even to my FN five-seven.
With my handguns it does take more effort to rack the slide on my 1911 'clone' 9mm due to an old left hand tendon injury that flairs up occasionally(1). But I can still rack my Mak okay and I still have my .38 Colt snubby with +Ps for 'old reliable'. So I'm set for a few years. As long as my eyesight's good a handgun will do the job for me just fine.
So for this man I'd say get .38 Snubby Revolver. He doesn't even need +P loads, Hollow Points will do the job for him. And it'll fit in his fanny pack perfectly. Taurus makes some fine wheel guns and for reasonable prices.
(1) was okay for decades then re-injured it trying to stretch for a Chuck Barry 'special' guitar chord. That man has hands and a finger stretch that's HUGH.
"You might consider" a .22wmr revolver like this:
http://www.gunblast.com/Taurus-941Ultralite.htm
Smith makes a couple of good ones made for concealed carry too.
A head-band laser like they use on sharks.
Take a look at a Walther P22. It’s a .22 caliber semiauto, small and light. It requires very little hand strength to put a round in the chamber. Best thing is that there’s virtually no felt recoil. 10 or 12 round magazine, IIRC.
A hit with a .22 is better than a miss with a .44.
Polyframe Judge with PDX ammo used in SA mode. Also consider taking it to a smith to rework the hammer for more leverage to make it easier to cock and to also make the trigger easier to pull.
His at home wheel chair could have something mounted on it?
Carry gun could be any small cal. with a light trigger action that he’s comfortable with.
Take advantage of his mounting platforms.
Claymores for example... ;-)
Range report: Smith and Wesson Governor. This last weekend we took a family members newly purchased Governor out (along with four 1911 clones) to try it out. For the record, I have always thought of the Judge and the Governor as "gimmick guns">
Not anymore, family member purchased the Governor for following reasons: Wanted something to pack around for stream fishing and possibility of running into angry black bear or other critter, wanted something for the occasional fool hen along the road, wanted something that would make shooting easier with aging eyesight (so he purchased the model with Crimson Trace laser grips)
We shot OOO Buck, Slugs, the Winchester PDX load (three disc's plus 12 BB's) and finally number #8 shot. Very satisfying was to watch the laser on a paper plate at 27' turn into several large holes (OOO buck). My recommendation would be the mild shooting PDX load for home use, I feel most anybody could comfortably shoot this load with the anticipated satisfactory result.
Will respond to any questions later in the day and try to post a short vid or two.
Google the Palm Pistol, a single shot pistol for the disabled.
A quality DA snubbie would be one answer - if the man’s hand weakness would not prevent him manipulating a DA trigger. The revolver negates the concern over limp wristing an auto. The Beretta 84 is a viable option because of the tip-up barrel - Buffalo Bore 380 ACP loads are better than big threee FMJs any day. The KelTecs have quality issues, so IMO, they’re no option.
Depending on how weak he is, how about a 642 type revolver with a lighter trigger spring installed?
Also, there is a guy here who makes a slide racking thingie for people who have trouble racking a slide. I will try to find the name of his “invention”.
I have a walther pps, which I chose specifically for it’s easy to rack slide. Some new shooters I know thought it had recoil. For me, even when I’ve limp wristed it after shooting it about 75 times in a row, it usually fires...as in I always try to shoot it at least 75 times, when I go to the range, and have had 3 ftf’s out of thousands of rounds.