If you want a .40 revolver, here’s where you’ll get it. Also in 9mm and .45ACP.
If your primary home-defense gun is a semi-auto, but your significant other prefers a revolver, this is a way to use the same cartridge in both weapons.
I like the idea, but I’ll probably stick with my S&W 940 and 1917 — I like moonclips. They make reloading so fast.