I would strongly recommend that you do a lot of research before purchasing a PM9. Lots of people are having trouble with them right now. Go over to
www.glocktalk.com and click on the Gun-related forums about halfway down the page. It contains a Kahr subforum. Many, many account of barrel peening with these particular guns. I have one, but haven't shot it enough to evaluate for this problem. I'm thinking I might not want to mess with it. Now, my K9 and MK9 each have about 1000 rounds through them with no problems. Small, but they're probably just as heavy as the G26 (an excellent carry gun, btw).