Bill, Just got a used 239. Only shot it once. I really like the SAS which is a DAO. A lot of people like this trigger. I personally like Sigs in native mode. I want to try the DAK trigger though. I really love the S&W concealed hammer snubbies. Kinda like a high cap flatter wheel gun. The 239 will accommodate the .40 or .357 sig barrel. However, even though you can feed each from the same mag, it is my understanding that you can have FTF's if you do not 'match' the mag to the barrel. i.e., .357 orig.mag for .357 barrel. Also, only original Sig mags seem to function reliably. BTW, no need for decocker on the DAO's. Larry