In a semi-automatic firearm, what initiates the firing process?

In a semi-automatic firearm, the firing process is initiated by pulling the trigger. When the trigger is pulled, it engages the internal mechanism of the firearm that releases the firing pin or striker, which then strikes the primer of the cartridge, igniting the powder and firing the projectile. This action is the critical starting point for the discharge of the firearm, making it fundamental to the operation of semi-automatics.

The other aspects, such as releasing the safety, loading the magazine, and aiming the firearm, are important steps in preparing to fire, but none of these actions trigger the firing mechanism itself. Releasing the safety is a necessary step to allow the firearm to fire but does not initiate the firing. Loading the magazine ensures that ammunition is available, but it is not part of the firing sequence. Aiming is crucial for accuracy but is unrelated to the mechanical process that results in a shot being fired.