Left: In this cutaway view, we can see that the firing pin at rest does not enter the tube, and when it does, the proper firing pin protrusion that it is capable This does not mean this is the proper firing of pin protrusion when firing, just that it has not been interfered with. Since the hammer is under its own momentum when it strikes the firing pin and not under hammer spring pressure, the firing pin receives just enough pressure to solidly strike the primer. This obviously can not be seen in a complete launcher, but a quick view from the front looking down the empty tube towards a light surface will show whether the pin is operating properly. Press the firing pin in from the hammer view to ensure there is spring resistance. If no resistance, replace the spring