Honestly, if your budget is around 4-500 and you’re looking for a full size 9mm carry gun, you can definitely find a used Glock 17/19/43/45/48 gen 5 (depending what carry option you prefer)

A Glock is just going to stand up to more, hold more resale value, and you know for a fact it will go bang when you need it to. You can find spare mags for cheap and plentiful, used or new accessories/ holsters for cheap. If that’s your budget, you really should go for something just a little higher end.

Another great option would be a CZ P-10. They retail about 450, theres a full, compact, and subcompact size, optic ready, decent trigger out of the box. The Walter PDP can also be found used around that price, with probably the best trigger available in its price point. It’s better than some notoriously nice Canik triggers I’ve shot.

For another budget options you could find high capacity mags for, the Tisas Px-9 line is great, I had my eye on the PX-9 Duty gen 3 for a while before I bought my Glock 45. Retails new for around 325. Check out the Sarsilmaz SAR-9 too.