S&W 5904
I carry mine daily. It has never given me any trouble on the range, and I shoot a lot, because I have my own range. After buying this one used, I did change most of the springs, but only because I detail stripped it to have the slide reblued. I also refinished the frame in Brownell's GunKote and replaced the factory sights with Trijicons.
I would shoot a few hundred rounds through your 5904 first and see how it operates. If there are no problems, I would not change any other springs, other than the recoil spring which you already have. You could polish the feed ramp, but the beauty of 3rd Gen Smith autos is that they consume anything.
As for magazines, I prefer the stainless 5906 mags. They polish up really well. Check around, you may be able to find some used police trade-in mags. I have several and they work fine. Enjoy the new (to you) 5904.
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