The orange plastic 9mm dummies were a poor fit for the Mossberg MC1sc they were being used in. They would never eject, bah, BUT--they worked fine in my HK VP9's magazine and did a normal ejecting as dry fire. The only way the orange guys would work in the Mossberg was for pure hang fire clearing which is also an important thing to know. Admittedly, I am a newbie to semi-auto 9mm and have been a "wheel" guy revolver owner for years. Anyway, not sure why but as far as what worked really well for gry fire practice are from B's Dry Fire Snap Caps with the metal shell case.