My SIGs (and even my Beretta 92s) have stood up well to shooting the hotter NATO 9mm. In fact, I've never considered worrying about slide or frame wear with my SIGs, and let's just say, I use unholy amounts of hot loads ... If there's someone out there who's experienced severe wear or breakage on a 9mm SIG frame or slide caused by factory-produced ammo, even NATO ball, +P or even occasional +P+, I'd like to hear the story.