Congrats on the P239.
If I were going to buy a SIGARMS, that would be the model and caliber I'd buy. I've always considered the P239 chambered in 9mm to be one of the two best compact, lightweight, metal-framed, single column magazine 9mm compact pistols ever produced ... with the S&W 3913(series) being the other one.
I don't own a P239, mind you, but I might someday, especially if the price is right at an armorer's class sometime.
The ones I've handled and fired in 9mm and .40 S&W have all exhibited fine function and reasonable accuracy, although the placement of the slide stop lever has presented a training issue I had to help resolve for one of our folks (premature slide stop lever engagement related to user thumb positioning).
Sorry to hear about your less-than-satisfying experience with the G27. The only consolation that might be offered is that you're not the only person to express some puzzling and frustrating feeding & functioning issues with the subcompact G27. If I had to choose (again) between buying a G26 or G27 ... it would (again) be the G26. I chose the G26 after careful consideration of my own anticipated needs and preferences, and my personal (and observed) experiences with the various Glock models. I only picked up the G27 because I came across a deal that would likely not come my way ever again.
My G26 has offered normal and reliable feeding & functioning throughout the more than 5,000 rounds of various factory ammunition I've fired in it, including 115gr FMJ/JHP, 115gr JHP +P+, 124gr +P, 147gr JHP & 127gr JHP ... and that's just what I can remember off the top of my head. I replaced a stock recoil guide rod/spring assembly after approx 2,500 rounds, because the lip of a guide tube was becoming deformed, but it hadn't affected functioning when I noticed it and replaced it.
My personal G27 has probably experienced a dozen or less feeding & functioning issues in approx the same number of rounds ... which I suspect were attributed to a mixture of magazine, ammunition & shooter related influences, at one time or another. I remember a couple being caused by out-of-spec ammunition (overly long case length and low-powered load, in separate contract LE loads offered by two different manufacturers
), and the rest were a mix of occurrences seemingly related to a single magazine, and then some last-round 'nose-dive' occurrences were involved with a couple of factory 11-round (w/factory +2 bases) G27 magazines ... and I suspect a couple of occurrences were caused by my not maintaining a locked wrist/firm grip under some isolated training/shooting conditions. It can happen ...
Congrats again on the P239.