I was browsing the Sig website and came across the the P938. It is an oddity in the Sig line like like the P238, at least in the fact that it is a non-traditional (meaning non-1911) single-action. Notwithstanding the P210 which is in a class all in its own.
I am not sure how Sig came along this line (P238 and P938) but I am impressed. There are stories that Sig bought the rights to Colt's Mustang (and equipment) which had been discontinued for years. But, Colt recently reintroduced them so I am not sure if that is true. Although according to Colt they are building them on new CNC machinery.
Anyway, the Mustang (IMO) was an under-rated pistol. A joy to shoot and very popular at training classes with new shooters. Remarkably accurate considering the rudimentary sights. If you like small thin single-action pistols it is great. And unique. Enter the P938! A Mustang scaled up to 9mm! I like it.
It reminded me of the Star FireStar. At the time it was a maligned pistol, but it was far ahead of its time. I regret not getting one. They worked. I found this article http://www.policeone.com/police-products/firearms/articles/6426721-The-SIG-P938-is-reminiscent-of-the-Star-PD/.
The P938 reminded the author of a Star PD. I think that is probably a more accurate assessment based on the lightweight frame. Another pistol way ahead of its time. Star sure built some nice pistols.
Anyway, the Sig P938 is definitely worth considering IMO if you are looking for something small without a 30# DAO trigger pull.