i was thinking of those, as of metal ones, not even sure if i ever saw any. frankly, i never even did care to see any.
it`s like - "do you want to buy a kahr" here, is like, "do you want to buy a renault". i guess you may, but, why?
When the K9 came out, it was a revolutionary design. It was far thinner than other carry 9s, much smaller even than the single-stack SIG P239. I owned both and I much preferred to carry the K9 over the P239.
Like a Glock, it is striker fired, but it has a very different trigger feel, with a long, smooth pull. This was back in the day when DAOs were popular, young Jedi, — in addition to selling the 3913, Smith also sold the DAO version 3953. This had a trigger more similar to a DAO than a Glock. And there weren’t many polymer-framed handguns. So steel was still a viable choice.
So the K9 and K40 were very small, thin, dedicated concealed carry guns that were easy to carry and very well made.
But now the market has changed. Polymer-framed guns rule the market. Then SIG and Glock came out with their thin, stack-and-half models, P365xl, G43x, and G48. The G43x is similar size to a K9, but lighter, holds 10+1 instead of 7+1, can mount a light and optic, etc. so the K9/K40 are no longer relevant in the market.
But the market was very different 25-30 years ago. Back then, the K9/K40 was a very viable gun for someone who wanted to belt-carry a 9mm but wanted something thinner than a Glock 19. For someone smaller like me, it was easier for me to conceal a K9 under a Hawaiian shirt than a Glock 19. Today we have many more choices.