If you're considering going the polymer/striker route, and you want a sub-compact, I would highly recommend the P-10S, and esp. the new OR version. Vastly superior ergonomics, trigger and sights to a G48 imo. And of course, it's optics-ready, so you've always got that option without having to send it away and get it milled. And they make 10-round mags for it.