This Fobus Paddle Holster Double Mag Pouch will work for your Kimber magazines. It is adjustable using retention screws that allow it to fit most single stack 9mm and .40 cal magazines. For a single pouch I would recommend the Comp-Tac Single Magazine Pouch w/Belt Clip found using the following link:
https://www.opticsplanet.com/comp-tac-single-magazine-pouch-w-belt-clip.html?_iv_gun-make=colt&_iv_gun-model=colt-1911
Yes, this should fit the SCCY CPX-2.
This will not fit the Smith & Wesson M&P 9mm. Follow the link below for a mag carrier that will fit.
https://www.opticsplanet.com/fobus-6909ndbh-double-magazine-holders.html
This will not fit the Glock 43X. It doesn't appear the Fobus makes one that specifically fits the 43X at this time, but follow the link below for a mag carrier that will fit the Glock 43 and Sig P365, which should be comparable in size and adjustable to fit.
https://www.opticsplanet.com/fobus-evo-double-mag-ambi-pouch.html
This will not fit the Glock 43X. It doesn't appear the Fobus makes one that specifically fits the 43X at this time, but follow the link below for a mag carrier that will fit the Glock 43 and Sig P365, which should be comparable in size and adjustable to fit.
https://www.opticsplanet.com/fobus-evo-double-mag-ambi-pouch.html
This will fit the Ruger LC9s. This will not fit the M&P shield, but follow the link below for the mag carrier that will.
https://www.opticsplanet.com/fobus-evo-double-mag-ambi-pouch.html
This will not fit the M&P shield, but follow the link below for the mag carrier that will.
https://www.opticsplanet.com/fobus-evo-double-mag-ambi-pouch.html
Yes, this should work for a .380 single stack as well.
No, it will not.