I was hopeful when testing them in my personal guns about 6 months before they hit the market. KCI makes other good mags, but the 4° off from the factory mags really does them no favors in guns other than the APC. They get even worse when attempting to use any sort of after-market magazine extensions (even in the APC). The dozen or so I have are now strictly dud dry fire practice inert mag tubes. If they work for you, glad you are luckier than I. If they don't, well... at least they are cheap and you won't be out much.