I was reading about them but never saw them. I also was concerned about the 90º twist then pull it straight out. I suspect that when you place it in, and turn it into the locked position you would be safe. My question is, what if the plug in its own, worked itself backward. Is that possible? I admit it would be nice to just turn a breech plug and pull it out. If it were safe, and I am sure they have tested the devil out of the design.