I have a mag fed one, was the first gun I bought many years ago. I took it apart just last year to clean it properly for the first time ever. It wasn't malfunctioning or anything, the mags weren't staying in and I had to tweak the mag catch spring, so I figured I should clean it while I had it apart. I have no idea how many thousands of rounds I've put through that gun over the years, but it's always worked. There's a screw at the bottom of the receiver that you loosen, then the barrel slides out, along with the bolt and striker. It's a real pain to get everything back in place, and I don't plan on doing it again if I don't have to. I think the old Ruger MK series pistols are way easier, and lots of people don't want them because they're too hard to strip and reassemble.
Kristian