Its zstep7 with the 45 m&p. I did some research on the pistol and found that it has a magazine disconnect equipped. I can't tell you exactly how it works though, I just know that it does have one. The manual says that it prevents the pistol from firing when the magazine is removed from the pistol. I've never had to worry about it so I never tested it. If your familiar with the pistol, it has a small lever mechanism in the magazine well. Pistols without the feature will not have the lever.