I also bought an almost new 9mm 239 last summer after a disastrous two months trying out another brand (won't mention the name since a lot of my buddies like this particular brand). The 239 fed flawlessly and was very accurate (like all my Sigs).
Several months ago, I bought another 239, this one a slightly used, two-tone, 40 cal with Hogue grips from a local LEO. I promptly called Sig and ordered the .357 Sig barrel and two .357 Mags (they are different for the single stack 239 models and are the same for the double stack Sigs).
Love the .357 Sig round in this gun.
One of my LEO retired friends, bought his first carry gun in 20 years (a nice compact Glock 40 cal). He really likes the Glock but when he handled my 239/.357 Sig, he said with a grin on his face, "Now that's a gun !!!".
I have several Glocks (19 and 36) and they are great guns. But I really like both my P239s because of what they are (classic, all metal, accurate, and a little heavier than my Glocks but that's what makes them elicit, "Now that's a gun") .
Good luck with your 239 9mm--Great price also.
I know you will like it.