That's term used constantly on gun forums and I can't say that it's a correct term for any firearm. Why? Because they are mechanical devices that rely on an ingredient that no gun maker can control. I've heard the term used constantly about .22 semi automatics and sorry, I just don't believe it. There is not a brand of .22 ammunition out there that won't malfunction because of the rimfire priming compound. It's a given. Yes, but my centerfire .475 Zelman is flawless. Sure it is until you hit that one bad primer. My Son's .45 Springfield Armory XD has not malfunctioned in eight years. He shoots quite a bit and yesterday on the Family Range a click, no bang. Cheap ammunition? No, Gold Dot. Put the round in my Glock 21 click, no bang. It will happen with any ammunition. I don't ever use the term "Flawless".