help.., revolver type pistols for my grandad (suggestions)

Greetings, HJshoots
Here are my favorite air pistols:

Crossman Vigilante (BB/pellet) $56
https://www.airgundepot.com/crosman-vigilante-revolver.html

Umarex Walther PPK/S (BB) $78
https://www.airgundepot.com/walther-ppk-s-bb-pistol.html#AGD-1201063

Sig Sauer 1911 "We The People" (BB) $100
https://www.airgundepot.com/sig-sauer-1911-we-the-people-bb-pistol.html#AGD-45928975

Smith & Wesson M&P (BB/pellet) $43
https://www.airgundepot.com/smith-wesson-mp-40-bb-pistol.html

The last one in my case is an Umarex Morph-3X (BB). Sadly, it appears to be unavailable at this time. I've used this to shoot mice at 8-10 yards with the long barrel. Pretty accurate for a BB gun, but no match against my Avanti Champion 499B.
https://www.umarexusa.com/umarex-morph-3x

~ Mondo

Two things:
I over estimated the distance I've shot mice with the Morph. It's closer to 3-5 yards.
Also, the picture attachment looks like it didn't upload. So, here it is again:
~ Mondo

Damn... forgot one!
This one isn't in my case because I carry it in my western holster:

John Wayne Colt Peacemaker (BB/pellet) $150
https://www.airgundepot.com/john-wayne-colt-peacemaker-weathered.html

See the Dog Soldier kill a rattlesnake with his Peacemaker:
https://www.airgun101.com/american-airgunner/video/1-pellet-gun-video-on-american-airgunner-ever-american-airgunner

~ Mondo