Virgilio, If there is any question get a revolver. You have asked about several semi-autos. Could be easy to rack for somebody, but not you with arthritis. And as you know some days are worse then others. Try it at a gun shop. They will let you try to rack the slide. My P320s are tougher to rack then my Glocks.

all of the 9mm guns are going to be close in the effort to rack them with your hand issues I suggest either a 38 special revolver or waiting for the just announced S&W Shield EZ which should hit the markets soon guns.com/news/2019/12/12/sw-shield-ez-9mm

Virgilio, the Sig P320 Nitrom Compact is no slightly easier to rack than a Glock pistol. One of the easiest to rack (purposely built just for this function) is the Smith & Wesson M&P9 M2.0 Shield EZ 9mm. Manual Safety Model = budsgunshop.com/product_info.php/products_id/411559113/smith+%26+wesson+m%26p9+m20+shield+ez+9mm+thumb+safety ------ Non Manual Safety Model -------- budsgunshop.com/product_info.php/products_id/411559114/smith+%26+wesson+m%26p9+m20+shield+ez+9mm