I was wondering if anyone has used those EFK 316 stainless barrels in any of thier Glocks and if so, how do they work? They have a coversion barrel for a Glock 31 to convert it to a 9mm, and they claim all you have to do is drop the barrel in and get a Glock 17 mag. I have also seen other 9mm conversion barrels, but they say that you might need to change the ejector and extractor also. Has anyone converted thier Glock 31/22 to a 9mm? Does it work or should I spend the extra money and buy a used Glock 17?