What is the function of a primer in ammunition?

The function of a primer in ammunition is to ignite the propellant when struck. Primers are an essential component of ammunition as they initiate the firing process. When the firing pin strikes the primer, it creates a small explosion that ignites the powder contained in the cartridge. This ignition leads to the rapid expansion of gases that propel the bullet down the barrel of the firearm.

Understanding the role of the primer is crucial for comprehending how ammunition operates as a complete system. Although other components of ammunition also play significant roles, the primer is specifically designed to serve the purpose of initiating combustion, which is vital for the accurate and effective discharge of the round.