The other day I was thinking about the primer being the most important part of the firing sequence -- but quickly realized it is only one link in the entire chain . . .
Before the primer can explode, it must be struck...
Before it is struck, the hammer must fall...
Before that, the trigger must be pulled...
And before the trigger is pulled, there must be a decision made to fire the gun... (There better have been a decision made to fire the gun. If not, that indicates negligence in trigger finger discipline!)
In the end, I wound up with 17 steps in the chain of events that describes the gun-firing sequence ::
A decision is made to fire the gun, which
Moves your finger into the trigger guard, which
Allows your finger to press the trigger, which
Unleashes the energy stored in the hammer or striker spring, which
Propels the hammer down or striker forward, which
Hits the primer, which
Causes it to explode, which
Ignites the powder, which
Burns -- changing it from a solid to a gas. Lots of gas, which
Generates the pressure that forces the bullet down the barrel, which
Results in the forward momentum of the bullet going toward the target, and which
Pushes the brass rearward, contacting the breech face, which
Results in the rearward momentum and movement of the slide, which
Ejects the spent case and compresses the recoil spring, which
Uncompresses -- moving the slide back to its forward position, which
Loads a new cartridge into the chamber, which
Reloads the gun for the next shot -- for whenever you decide to shoot it.
Or . . . you pull the trigger -- the gun goes BANG. Either way you want to look at it...