Smoothbore
The classic European matchlock gun was a smoothbore weapon that held a burning slow match in a clamp at the end of a small curved lever called a "serpentine". When the lever (or in later models a trigger) was pulled, it lowered the smoldering match into the flash pan. This ignited the priming powder. The flash from the primer travelled through the touch hole igniting the main charge of propellant in the gun barrel.