I just posted in a thread about a guy wanting a revolver for his girlfriend with limited hand strength due to CP.
The same advice I gave there applies here - but here’s the summary:
1) Some pistols don’t require you to rack a slide at all.
2) selecting a high profile sight can allow the person to rack a slide one handed (using arm not hand strength) off a number of suitable surfaces.
3) hammer fired pistols are a better option. Cocking the hammer requires a great deal of the total force used in racking the slide, at least initially into the hammer is cocked. Manually cocking the hammer first will consequently significantly reduce the peak force needed to rack the slide, and it lets the person get the slide moving where inertia helps take care of the rest. That’s especially true in lighter calibers and with locked breech designs with lighter recoil springs.
4) Think outside the box for ways to accommodate racking the slide, and don’t get hung up on the manual of arms when the essentially function is being able to shoot the handgun. Reloads just are not a real world issue in 99% of armed citizen self defense shoots. (see the other thread)