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Primer (firearm)
In firearm ballistics, the primer () is a component of pistol, rifle, and shotgun rounds. Upon being struck with sufficient force, a primer reacts chemically to produce heat which ignites the main propellant charge and fires the projectile.
==Priming methods==
The first step to firing a firearm of any sort is igniting the propellant. The earliest firearms were cannons, which were simple closed tubes. There was a small aperture, the "touchhole", drilled in the closed end of the tube, leading to the main powder charge. This hole was filled with finely ground powder, which was then ignited with a hot ember or torch. With the advent of hand-held firearms, this became an undesirable way of firing a gun. Holding a burning stick while trying to pour a charge of black powder carefully down a barrel is dangerous, and trying to hold the gun with one hand while simultaneously aiming at the target and looking for the touchhole makes it very difficult to fire accurately.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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