My cousin just purchased a LNIB P290 in 9mm .... Great pistol... I just have had the chance to run around 50rds through the pistol.... I like the trigger .. DAO ..feels similar to a a S&W 642 I once owned that had a great trigger job ...The Sig P290RS 380 and 9mm are the same height(3.9"), length(5.5"), and width(1.1") as the P238. The P290 is a double action only (DOA) pistol, and for some that is a plus and others it is a minus. I have owned both versions (380 and 9mm), and the P290RS is the softest 380 I have owned, and I have owned quite a few. It is 5 oz heavier than the P238. If cocked and locked is your preference, P238 would work, if heavier trigger with a second strike capability matters the P290RS might work. One benefit of the P290RS is that you can get it in 9mm and it has the same dimensions as the P238, in a DAO platform.
I had no failure issues with either P290RS that I owned.
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Not too easy to find, but always a variety of new and used on Gunbroker.
Though a small pistol , with 124gr FMJ , very manageable.... BTW .. He got it at a steal at a LGS
My deep concealment pistol is a Taurus TCP .. Good trigger .. Has been very dependable...