I agree with the idea of a .32 or light .38sp. But it also depends on how your arthritis exhibits. a double action revolver trigger might be a bit much, and too light of a gun has its own problems.
Before putting his money down for a revolver he might want to explore tip up barrel semi-autos such as the Beretta 3032 or similar. they have a single action trigger and the tip up action is much easier than a slide for most people.
http://www.beretta.com/en-us/3032-tomcat-inox/
Before putting his money down for a revolver he might want to explore tip up barrel semi-autos such as the Beretta 3032 or similar. they have a single action trigger and the tip up action is much easier than a slide for most people.
http://www.beretta.com/en-us/3032-tomcat-inox/