I remember seeing a website a few years ago that offered suppressed Camp 9's and Camp .45's, but that's long gone. Now THAT would be a fun toy to have! A DeLisle is still at the top of my wish list though.
You can find a few of those occasionally. I'd rather have something else, though.
The Carbines are undersprung from the factory. I installed heavier Wolff springs and a Blackjack buffer in mine for insurance. They come apart kind of like a big 10/22, so it's not a nightmare to do this very basic maintenance on them.