same here, they work perfectly in my mark ii. for "aftermarket" mags, they are the best out there. I say "aftermarket" because they actually manufacture the "factory" mags that come with many modern pistols. between my beretta, hk, and sigs, I have dozens of them, and I haven't had a single issue with them. the best thing about them is they are often about half the price of "factory" mags.