Full Metal Jacket
member
glock or m&p .45 is an excellent, and reliable choice.
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This is an excellent point. I have a cousin who has arthritis in his hands; he doesn't shoot for fun. His handgun of choice is a revolver because he finds it too hard to manipulate the slide of a semi-auto.He couldn't gather enough strength to pull the slide back consistently each time.
IMO your dad will be well served by a S&W Model 10 revolver. You can find them used for a very fair price and he can then own the original M&P. You can fit any type of grips your dad needs to make shooting comfortable and the .38 Special won't beat him up while still being a good SD round. The 158gr LSWC/HP round (The FBI Load) will do the job indoors without excessive flash or bang... Also, there's no chance of the normal problems associated with a semi-auto that may be a problem for your father to clear because of his Fibromyalgia. Just a few things that might matter...He needs a full size gun since he has fibromyalgia and needs something large he can grip.